- Uasin Gishu disease virus
- Uganda S virus
- Ugandan cassava brown streak virus
- Ugymyia sericariae NPV
- Ulcerative disease rhabdovirus
- Ullucus mild mottle virus
- Ullucus mosaic virus
- Ullucus virus C
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- Umatilla virus
- Umbre virus
- Una virus
- Upolu virus
- Upsilonpapillomavirus 1
- Upsilonpapillomavirus 2
- UR2 sarcoma virus
- Uranotaenia sapphirina NPV
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- Urbanus proteus NPV
- Urochloa hoja blanca virus
- Urochloa streak virus
- Urucuri virus
- Ustilago maydis virus 1
- Ustilago maydis virus 4
- Ustilago maydis virus 6
- Ustilago maydis virus H1
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- Usutu virus
- Utinga virus
- Utive virus
- Uukuniemi virus
- Uukuniemi virus group
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