There are 154 insects that start with the letter U, from Uacho Beetle to Utethesia Moth. Below you will find them listed alphabetically along with some general information about each. Click the toggle view buttons in the top right corner to switch between the card and the table view.
For each item you will find the following information
Order: The subclass the insects belongs to
Habitat: The places or type of weather the insects lives in
Scientific name: The designation that scientists use to catalog the species
Name: Uacho Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uacho sp.
Name: Uagui Butterfly
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uagui sp.
Name: Uahuka Grasshopper
Order: Orthoptera
Habitat: Mountainous regions of Hawaii
Scientific name: Uahuka brachyptera
Name: Uahuka Longhorn Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uahuka sp.
Name: Uahuka Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uahuka sp.
Name: Uaj Moth
Order: Lepidoptera
Habitat: Temperate forests
Scientific name: Uaj sp.
Name: Uaka Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uaka sp.
Name: Uakari Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uakari sp.
Name: Uanadi Cicada
Order: Hemiptera
Habitat: Tropical forests of Central America
Scientific name: Uanadi spp.
Name: Uani Katydid
Order: Orthoptera
Habitat: Tropical forests
Scientific name: Uani sp.
Name: Uapou Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uapou sp.
Name: Uapou Longhorn Beetle
Order: Coleoptera
Habitat: Forests of Marquesas Islands
Scientific name: Uapou spp.
Name: Uassu Cicada
Order: Hemiptera
Habitat: Tropical forests
Scientific name: Uassu sp.
Name: Uaupes Longhorn Beetle
Order: Coleoptera
Habitat: Rainforests of Colombia and Brazil
Scientific name: Parandra uaupesensis
Name: Uaxactun Bug
Order: Hemiptera
Habitat: Tropical forests
Scientific name: Uaxactun bureus
Name: Uaxactun Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uaxactun sp.
Name: Ubaghsi Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ubaghsi sp.
Name: Ubaghsi Moth
Order: Lepidoptera
Habitat: Central Asia
Scientific name: Ubaghsia balcanica
Name: Ubangi Horntail
Order: Hymenoptera
Habitat: Tropical forests
Scientific name: Urocerus ubangiensis
Name: Ucarania Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ucarania sp.
Name: Ucayali Morpho
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Morpho ucayalensis
Name: Uchidai Beetle
Order: Coleoptera
Habitat: Japan
Scientific name: Uchidaia japonensis
Name: Uchiumi Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Uchiumi sp.
Name: Uchiuringa Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uchiuringa sp.
Name: Uchiyamaia Beetle
Order: Coleoptera
Habitat: Japan
Scientific name: Uchiyamaia sumatrana
Name: Uchu Beetle
Order: Coleoptera
Habitat: Deserts
Scientific name: Uchubius deserticola
Name: Uchua Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uchua sp.
Name: Ucumari Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ucumari sp.
Name: Udaipuria Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Udaipuria sylvatica
Name: Udaspes Moth
Order: Lepidoptera
Habitat: Southeast Asia
Scientific name: Udaspes folus
Name: Uddin's Crab Spider
Order: Araneae
Habitat: Grasslands
Scientific name: Uddin's crab spider
Name: Udea Moth
Order: Lepidoptera
Habitat: Worldwide
Scientific name: Udea olivalis
Name: Udenopus Beetle
Order: Coleoptera
Habitat: Grasslands
Scientific name: Udenopus gramineus
Name: Udiyana Beetle
Order: Coleoptera
Habitat: Malaysia
Scientific name: Udiyana semistriata
Name: Uehara's Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Uehara's beetle
Name: Uehurai Beetle
Order: Coleoptera
Habitat: Japan
Scientific name: Uehuraia mimasaka
Name: Uenoi Moth
Order: Lepidoptera
Habitat: Japan
Scientific name: Uenoi japana
Name: Uenoites Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Uenoites sp.
Name: Uenolestes Beetle
Order: Coleoptera
Habitat: Japan
Scientific name: Uenolestes japonicus
Name: Uenonomus Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Uenonomus sp.
Name: Uetta Moth
Order: Lepidoptera
Habitat: Temperate forests
Scientific name: Uetta quercea
Name: Ufa Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ufa sp.
Name: Ufens Wasp
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Ufens sp.
Name: Ufo Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ufoforus luminous
Name: Uga Termite
Order: Isoptera
Habitat: Tropical forests
Scientific name: Uga sp.
Name: Ugandana Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ugandana sp.
Name: Ugao Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ugao sp.
Name: Ugglan Moth
Order: Lepidoptera
Habitat: Boreal forests
Scientific name: Ugglan borealis
Name: Ugi Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ugi sp.
Name: Ugorsk Moth
Order: Lepidoptera
Habitat: Temperate forests
Scientific name: Ugorsk sp.
Name: Ugursa Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ugursa sp.
Name: Uhabia Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uhabia sp.
Name: Uinga Moth
Order: Lepidoptera
Habitat: Tropical forests of Southeast Asia
Scientific name: Uinga spp.
Name: Uinta Ant
Order: Hymenoptera
Habitat: Montane meadows
Scientific name: Formica uintaensis
Name: Uinta Caddisfly
Order: Trichoptera
Habitat: Cold mountain streams of the Uinta Mountains
Scientific name: Glossosoma uinta
Name: Uinta Chipmunk Cricket
Order: Orthoptera
Habitat: Rocky mountain regions, western North America
Scientific name: Uintacris uintensis
Name: Uinta Damselfly
Order: Odonata
Habitat: Marshes and ponds of the Uinta Mountains
Scientific name: Enallagma uinta
Name: Uinta Dragonfly
Order: Odonata
Habitat: Lakes and rivers of the Uinta Mountains
Scientific name: Sympetrum uinta
Name: Uinta Grasshopper
Order: Orthoptera
Habitat: Western North America, Rocky Mountains
Scientific name: Uintacris uintensis
Name: Uinta Ground Beetle
Order: Coleoptera
Habitat: Rocky mountain regions, western North America
Scientific name: Amara uintensis
Name: Uinta Hoverfly
Order: Diptera
Habitat: Rocky mountain regions
Scientific name: Eupeodes uintensis
Name: Uinta Midge
Order: Diptera
Habitat: High-altitude streams of the Uinta Mountains
Scientific name: Uvarus uinta
Name: Uinta Shield Bug
Order: Hemiptera
Habitat: Rocky mountain regions, western North America
Scientific name: Brochymena uhleri
Name: Uinta Trembling Grasshopper
Order: Orthoptera
Habitat: Rocky mountain regions, western North America
Scientific name: Podisma uintensis
Name: Uistrea Moth
Order: Lepidoptera
Habitat: Europe
Scientific name: Nycteola uistrea
Name: Uithaea Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uithaea sp.
Name: Ujutai Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ujutai sp.
Name: Ukari Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ukari sp.
Name: Ukauki Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ukauki nigra
Name: Ukhrul Planthopper
Order: Hemiptera
Habitat: Grasslands
Scientific name: Ukhrulia montana
Name: Ukichiro Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Ukichiro sp.
Name: Ukiwa Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Ukiwa sp.
Name: Ulaan Moth
Order: Lepidoptera
Habitat: Grasslands
Scientific name: Ulaan sp.
Name: Ulbrichti Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Ulbrichti sp.
Name: Ulianas Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ulianas sp.
Name: Ulicea Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ulicea sp.
Name: Ulisama Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ulisama sp.
Name: Ulmo Moth
Order: Lepidoptera
Habitat: Temperate forests
Scientific name: Ulmo olivacea
Name: Ulomyia Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ulomyia sp.
Name: Ulubat Beetle
Order: Coleoptera
Habitat: Wetlands
Scientific name: Ulubatia aquatica
Name: Uluguru Bush Cricket
Order: Orthoptera
Habitat: Tropical forests
Scientific name: Uluguru bush cricket
Name: Umalia Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umalia sp.
Name: Umara Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umara sp.
Name: Umasama Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umasama sp.
Name: Umbala Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Umbala sp.
Name: Umbei Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Umbei sp.
Name: Umbo Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Umbo sp.
Name: Umbonia Treehopper
Order: Hemiptera
Habitat: North and South America
Scientific name: Umbonia crassicornis
Name: Umbra Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Umbra sp.
Name: Umbra Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Umbra crepuscularis
Name: Umbratus Cricket
Order: Orthoptera
Habitat: Grasslands
Scientific name: Umbratus cricket
Name: Umbreal Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umbreal sp.
Name: Umbriago Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umbriago sylvatica
Name: Umbrid Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umbrid sp.
Name: Umbrobunaea Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Umbrobunaea regalis
Name: Umebachi Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Umebachi sp.
Name: Umka Moth
Order: Lepidoptera
Habitat: Tundra
Scientific name: Umka arctica
Name: Umkondo Mantis
Order: Mantodea
Habitat: Tropical forests
Scientific name: Umkondo mantis
Name: Ummidia Trapdoor Spider
Order: Araneae
Habitat: Grasslands
Scientific name: Ummidia trapdoor spider
Name: Umpqua Firefly
Order: Coleoptera
Habitat: Temperate forests
Scientific name: Photinus umpquensis
Name: Umzinto Ant
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Umzinto ant
Name: Unabilla Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Unabilla sp.
Name: Unaca Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Unaca sp.
Name: Unagami Moth
Order: Lepidoptera
Habitat: Temperate forests of Japan
Scientific name: Unagami spp.
Name: Unalakleet Beetle
Order: Coleoptera
Habitat: Coastal regions of Alaska
Scientific name: Unalakleet spp.
Name: Unalaska Beetle
Order: Coleoptera
Habitat: Tundra
Scientific name: Unalaskanus glacialis
Name: Unamon Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Unamon amazonica
Name: Unatilla Moth
Order: Lepidoptera
Habitat: Pacific Northwest forests
Scientific name: Unatilla spp.
Name: Unau Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Unau sp.
Name: Uncala Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uncala sp.
Name: Uncarina Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uncarina sp.
Name: Uncompahgre Fritillary Butterfly
Order: Lepidoptera
Habitat: Alpine meadows of Colorado
Scientific name: Boloria improba acrocnema
Name: Uncula Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uncula sp.
Name: Undana Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Undana quercea
Name: Undang Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Undang sp.
Name: Undara Trapdoor Spider
Order: Araneae
Habitat: Grasslands
Scientific name: Undara trapdoor spider
Name: Undawas Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Undawas sp.
Name: Undella Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Undella sp.
Name: Underwood's Moth
Order: Lepidoptera
Habitat: Woodlands of the Southeastern United States
Scientific name: Underwoodus spp.
Name: Undusa Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Undusa sp.
Name: Unduva Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Unduva nigra
Name: Uneeda Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Uneeda sp.
Name: Ungalla Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ungalla sp.
Name: Ungalli Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Ungalli sp.
Name: Unge Beetle
Order: Coleoptera
Habitat: Tropical forests of Southeast Asia
Scientific name: Unge spp.
Name: Ungere Ant
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Ungere ant
Name: Ungetum Beetle
Order: Coleoptera
Habitat: Rainforests of Central and South America
Scientific name: Ungetum spp.
Name: Ungli Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Ungli sp.
Name: Uniala Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uniala sp.
Name: Unian Moth
Order: Lepidoptera
Habitat: Temperate forests
Scientific name: Uniana sylvatica
Name: Uniculus Ant
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Uniculus ant
Name: Unicus Ant
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Unicus ant
Name: Unicus Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Unicus sp.
Name: Unides Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Unides sp.
Name: Uniga Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Uniga sp.
Name: Unileaf Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Unileaf sp.
Name: Unimonas Moth
Order: Lepidoptera
Habitat: Tropical forests
Scientific name: Unimonas sp.
Name: Uninus Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Uninus sp.
Name: Unipus Beetle
Order: Coleoptera
Habitat: Tropical forests
Scientific name: Unipus sp.
Name: Unwinged Bat Bug
Order: Hemiptera
Habitat: Worldwide
Scientific name: Cacodmus uncinatus
Name: Uozu Moth
Order: Lepidoptera
Habitat: Temperate forests of Japan
Scientific name: Uozu spp.
Name: Uparmia Moth
Order: Lepidoptera
Habitat: Tropical forests of Central and South America
Scientific name: Uparmia spp.
Name: Upia Moth
Order: Lepidoptera
Habitat: South America
Scientific name: Upia upia
Name: Uraba Lugens
Order: Lepidoptera
Habitat: Australia
Scientific name: Uraba lugens
Name: Uralian Moth
Order: Lepidoptera
Habitat: Boreal forests of northern Eurasia
Scientific name: Uralian spp.
Name: Urania Birdwing
Order: Lepidoptera
Habitat: South America
Scientific name: Urania leilus
Name: Urania Moth
Order: Lepidoptera
Habitat: South America
Scientific name: Urania fulgens
Name: Urda Moth
Order: Lepidoptera
Habitat: Tropical forests of Southeast Asia
Scientific name: Urda spp.
Name: Urellia Fly
Order: Diptera
Habitat: Europe
Scientific name: Urellia stella
Name: Urichthys Beetle
Order: Coleoptera
Habitat: Coastal regions of the Caribbean
Scientific name: Urichthys spp.
Name: Urocerus Horntail
Order: Hymenoptera
Habitat: Worldwide
Scientific name: Urocerus gigas
Name: Urocoma Moth
Order: Lepidoptera
Habitat: South America
Scientific name: Urocoma crinita
Name: Ursula Brocade Moth
Order: Lepidoptera
Habitat: North America
Scientific name: Acronicta urticae
Name: Utethesia Moth
Order: Lepidoptera
Habitat: Africa and Asia
Scientific name: Utethesia pulchelloides
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Uacho Beetle | Coleoptera | Tropical forests | Uacho sp. |
| Uagui Butterfly | Lepidoptera | Tropical forests | Uagui sp. |
| Uahuka Grasshopper | Orthoptera | Mountainous regions of Hawaii | Uahuka brachyptera |
| Uahuka Longhorn Beetle | Coleoptera | Tropical forests | Uahuka sp. |
| Uahuka Moth | Lepidoptera | Tropical forests | Uahuka sp. |
| Uaj Moth | Lepidoptera | Temperate forests | Uaj sp. |
| Uaka Beetle | Coleoptera | Tropical forests | Uaka sp. |
| Uakari Moth | Lepidoptera | Tropical forests | Uakari sp. |
| Uanadi Cicada | Hemiptera | Tropical forests of Central America | Uanadi spp. |
| Uani Katydid | Orthoptera | Tropical forests | Uani sp. |
| Uapou Beetle | Coleoptera | Tropical forests | Uapou sp. |
| Uapou Longhorn Beetle | Coleoptera | Forests of Marquesas Islands | Uapou spp. |
| Uassu Cicada | Hemiptera | Tropical forests | Uassu sp. |
| Uaupes Longhorn Beetle | Coleoptera | Rainforests of Colombia and Brazil | Parandra uaupesensis |
| Uaxactun Bug | Hemiptera | Tropical forests | Uaxactun bureus |
| Uaxactun Moth | Lepidoptera | Tropical forests | Uaxactun sp. |
| Ubaghsi Beetle | Coleoptera | Tropical forests | Ubaghsi sp. |
| Ubaghsi Moth | Lepidoptera | Central Asia | Ubaghsia balcanica |
| Ubangi Horntail | Hymenoptera | Tropical forests | Urocerus ubangiensis |
| Ucarania Moth | Lepidoptera | Tropical forests | Ucarania sp. |
| Ucayali Morpho | Lepidoptera | Tropical forests | Morpho ucayalensis |
| Uchidai Beetle | Coleoptera | Japan | Uchidaia japonensis |
| Uchiumi Beetle | Coleoptera | Forests | Uchiumi sp. |
| Uchiuringa Moth | Lepidoptera | Tropical forests | Uchiuringa sp. |
| Uchiyamaia Beetle | Coleoptera | Japan | Uchiyamaia sumatrana |
| Uchu Beetle | Coleoptera | Deserts | Uchubius deserticola |
| Uchua Moth | Lepidoptera | Tropical forests | Uchua sp. |
| Ucumari Beetle | Coleoptera | Tropical forests | Ucumari sp. |
| Udaipuria Moth | Lepidoptera | Tropical forests | Udaipuria sylvatica |
| Udaspes Moth | Lepidoptera | Southeast Asia | Udaspes folus |
| Uddin's Crab Spider | Araneae | Grasslands | Uddin's crab spider |
| Udea Moth | Lepidoptera | Worldwide | Udea olivalis |
| Udenopus Beetle | Coleoptera | Grasslands | Udenopus gramineus |
| Udiyana Beetle | Coleoptera | Malaysia | Udiyana semistriata |
| Uehara's Beetle | Coleoptera | Forests | Uehara's beetle |
| Uehurai Beetle | Coleoptera | Japan | Uehuraia mimasaka |
| Uenoi Moth | Lepidoptera | Japan | Uenoi japana |
| Uenoites Beetle | Coleoptera | Forests | Uenoites sp. |
| Uenolestes Beetle | Coleoptera | Japan | Uenolestes japonicus |
| Uenonomus Beetle | Coleoptera | Forests | Uenonomus sp. |
| Uetta Moth | Lepidoptera | Temperate forests | Uetta quercea |
| Ufa Moth | Lepidoptera | Tropical forests | Ufa sp. |
| Ufens Wasp | Hymenoptera | Grasslands | Ufens sp. |
| Ufo Beetle | Coleoptera | Tropical forests | Ufoforus luminous |
| Uga Termite | Isoptera | Tropical forests | Uga sp. |
| Ugandana Moth | Lepidoptera | Tropical forests | Ugandana sp. |
| Ugao Beetle | Coleoptera | Tropical forests | Ugao sp. |
| Ugglan Moth | Lepidoptera | Boreal forests | Ugglan borealis |
| Ugi Beetle | Coleoptera | Tropical forests | Ugi sp. |
| Ugorsk Moth | Lepidoptera | Temperate forests | Ugorsk sp. |
| Ugursa Beetle | Coleoptera | Tropical forests | Ugursa sp. |
| Uhabia Moth | Lepidoptera | Tropical forests | Uhabia sp. |
| Uinga Moth | Lepidoptera | Tropical forests of Southeast Asia | Uinga spp. |
| Uinta Ant | Hymenoptera | Montane meadows | Formica uintaensis |
| Uinta Caddisfly | Trichoptera | Cold mountain streams of the Uinta Mountains | Glossosoma uinta |
| Uinta Chipmunk Cricket | Orthoptera | Rocky mountain regions, western North America | Uintacris uintensis |
| Uinta Damselfly | Odonata | Marshes and ponds of the Uinta Mountains | Enallagma uinta |
| Uinta Dragonfly | Odonata | Lakes and rivers of the Uinta Mountains | Sympetrum uinta |
| Uinta Grasshopper | Orthoptera | Western North America, Rocky Mountains | Uintacris uintensis |
| Uinta Ground Beetle | Coleoptera | Rocky mountain regions, western North America | Amara uintensis |
| Uinta Hoverfly | Diptera | Rocky mountain regions | Eupeodes uintensis |
| Uinta Midge | Diptera | High-altitude streams of the Uinta Mountains | Uvarus uinta |
| Uinta Shield Bug | Hemiptera | Rocky mountain regions, western North America | Brochymena uhleri |
| Uinta Trembling Grasshopper | Orthoptera | Rocky mountain regions, western North America | Podisma uintensis |
| Uistrea Moth | Lepidoptera | Europe | Nycteola uistrea |
| Uithaea Moth | Lepidoptera | Tropical forests | Uithaea sp. |
| Ujutai Moth | Lepidoptera | Tropical forests | Ujutai sp. |
| Ukari Moth | Lepidoptera | Tropical forests | Ukari sp. |
| Ukauki Moth | Lepidoptera | Tropical forests | Ukauki nigra |
| Ukhrul Planthopper | Hemiptera | Grasslands | Ukhrulia montana |
| Ukichiro Beetle | Coleoptera | Forests | Ukichiro sp. |
| Ukiwa Beetle | Coleoptera | Forests | Ukiwa sp. |
| Ulaan Moth | Lepidoptera | Grasslands | Ulaan sp. |
| Ulbrichti Beetle | Coleoptera | Forests | Ulbrichti sp. |
| Ulianas Moth | Lepidoptera | Tropical forests | Ulianas sp. |
| Ulicea Beetle | Coleoptera | Tropical forests | Ulicea sp. |
| Ulisama Moth | Lepidoptera | Tropical forests | Ulisama sp. |
| Ulmo Moth | Lepidoptera | Temperate forests | Ulmo olivacea |
| Ulomyia Moth | Lepidoptera | Tropical forests | Ulomyia sp. |
| Ulubat Beetle | Coleoptera | Wetlands | Ulubatia aquatica |
| Uluguru Bush Cricket | Orthoptera | Tropical forests | Uluguru bush cricket |
| Umalia Moth | Lepidoptera | Tropical forests | Umalia sp. |
| Umara Moth | Lepidoptera | Tropical forests | Umara sp. |
| Umasama Moth | Lepidoptera | Tropical forests | Umasama sp. |
| Umbala Beetle | Coleoptera | Tropical forests | Umbala sp. |
| Umbei Beetle | Coleoptera | Forests | Umbei sp. |
| Umbo Beetle | Coleoptera | Tropical forests | Umbo sp. |
| Umbonia Treehopper | Hemiptera | North and South America | Umbonia crassicornis |
| Umbra Beetle | Coleoptera | Tropical forests | Umbra sp. |
| Umbra Moth | Lepidoptera | Woodlands | Umbra crepuscularis |
| Umbratus Cricket | Orthoptera | Grasslands | Umbratus cricket |
| Umbreal Moth | Lepidoptera | Tropical forests | Umbreal sp. |
| Umbriago Moth | Lepidoptera | Tropical forests | Umbriago sylvatica |
| Umbrid Moth | Lepidoptera | Tropical forests | Umbrid sp. |
| Umbrobunaea Moth | Lepidoptera | Tropical forests | Umbrobunaea regalis |
| Umebachi Beetle | Coleoptera | Forests | Umebachi sp. |
| Umka Moth | Lepidoptera | Tundra | Umka arctica |
| Umkondo Mantis | Mantodea | Tropical forests | Umkondo mantis |
| Ummidia Trapdoor Spider | Araneae | Grasslands | Ummidia trapdoor spider |
| Umpqua Firefly | Coleoptera | Temperate forests | Photinus umpquensis |
| Umzinto Ant | Hymenoptera | Grasslands | Umzinto ant |
| Unabilla Moth | Lepidoptera | Tropical forests | Unabilla sp. |
| Unaca Moth | Lepidoptera | Tropical forests | Unaca sp. |
| Unagami Moth | Lepidoptera | Temperate forests of Japan | Unagami spp. |
| Unalakleet Beetle | Coleoptera | Coastal regions of Alaska | Unalakleet spp. |
| Unalaska Beetle | Coleoptera | Tundra | Unalaskanus glacialis |
| Unamon Moth | Lepidoptera | Tropical forests | Unamon amazonica |
| Unatilla Moth | Lepidoptera | Pacific Northwest forests | Unatilla spp. |
| Unau Beetle | Coleoptera | Tropical forests | Unau sp. |
| Uncala Moth | Lepidoptera | Tropical forests | Uncala sp. |
| Uncarina Beetle | Coleoptera | Tropical forests | Uncarina sp. |
| Uncompahgre Fritillary Butterfly | Lepidoptera | Alpine meadows of Colorado | Boloria improba acrocnema |
| Uncula Moth | Lepidoptera | Tropical forests | Uncula sp. |
| Undana Moth | Lepidoptera | Woodlands | Undana quercea |
| Undang Beetle | Coleoptera | Tropical forests | Undang sp. |
| Undara Trapdoor Spider | Araneae | Grasslands | Undara trapdoor spider |
| Undawas Moth | Lepidoptera | Tropical forests | Undawas sp. |
| Undella Beetle | Coleoptera | Tropical forests | Undella sp. |
| Underwood's Moth | Lepidoptera | Woodlands of the Southeastern United States | Underwoodus spp. |
| Undusa Beetle | Coleoptera | Tropical forests | Undusa sp. |
| Unduva Moth | Lepidoptera | Tropical forests | Unduva nigra |
| Uneeda Beetle | Coleoptera | Forests | Uneeda sp. |
| Ungalla Moth | Lepidoptera | Tropical forests | Ungalla sp. |
| Ungalli Beetle | Coleoptera | Tropical forests | Ungalli sp. |
| Unge Beetle | Coleoptera | Tropical forests of Southeast Asia | Unge spp. |
| Ungere Ant | Hymenoptera | Grasslands | Ungere ant |
| Ungetum Beetle | Coleoptera | Rainforests of Central and South America | Ungetum spp. |
| Ungli Moth | Lepidoptera | Tropical forests | Ungli sp. |
| Uniala Moth | Lepidoptera | Tropical forests | Uniala sp. |
| Unian Moth | Lepidoptera | Temperate forests | Uniana sylvatica |
| Uniculus Ant | Hymenoptera | Grasslands | Uniculus ant |
| Unicus Ant | Hymenoptera | Grasslands | Unicus ant |
| Unicus Beetle | Coleoptera | Tropical forests | Unicus sp. |
| Unides Beetle | Coleoptera | Tropical forests | Unides sp. |
| Uniga Moth | Lepidoptera | Tropical forests | Uniga sp. |
| Unileaf Beetle | Coleoptera | Tropical forests | Unileaf sp. |
| Unimonas Moth | Lepidoptera | Tropical forests | Unimonas sp. |
| Uninus Beetle | Coleoptera | Tropical forests | Uninus sp. |
| Unipus Beetle | Coleoptera | Tropical forests | Unipus sp. |
| Unwinged Bat Bug | Hemiptera | Worldwide | Cacodmus uncinatus |
| Uozu Moth | Lepidoptera | Temperate forests of Japan | Uozu spp. |
| Uparmia Moth | Lepidoptera | Tropical forests of Central and South America | Uparmia spp. |
| Upia Moth | Lepidoptera | South America | Upia upia |
| Uraba Lugens | Lepidoptera | Australia | Uraba lugens |
| Uralian Moth | Lepidoptera | Boreal forests of northern Eurasia | Uralian spp. |
| Urania Birdwing | Lepidoptera | South America | Urania leilus |
| Urania Moth | Lepidoptera | South America | Urania fulgens |
| Urda Moth | Lepidoptera | Tropical forests of Southeast Asia | Urda spp. |
| Urellia Fly | Diptera | Europe | Urellia stella |
| Urichthys Beetle | Coleoptera | Coastal regions of the Caribbean | Urichthys spp. |
| Urocerus Horntail | Hymenoptera | Worldwide | Urocerus gigas |
| Urocoma Moth | Lepidoptera | South America | Urocoma crinita |
| Ursula Brocade Moth | Lepidoptera | North America | Acronicta urticae |
| Utethesia Moth | Lepidoptera | Africa and Asia | Utethesia pulchelloides |