- Ichnovirus
- Ictalurid herpesvirus 1
- Ictalurid herpesvirus 2
- Idnoreovirus 1
- Idnoreovirus 2
- Idnoreovirus 3
- Idnoreovirus 4
- Idnoreovirus 5
- Ieri virus
- Iguanid herpesvirus 2
- Ilarvirus
- Ilheus virus
- Impatiens necrotic spot virus
- Imperata yellow mottle virus
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- Indian cassava mosaic virus
- Indian citrus ringspot virus
- Indian peanut clump virus
- Indonesian soybean dwarf virus
- Infantile gastroenteritis virus
- Infectious bovine rhinotracheitis virus
- Infectious bursal disease virus
- Infectious flacherie virus
- Infectious haematopoietic necrosis virus
- Infectious hematopoietic necrosis virus
- Infectious pancreatic necrosis virus
- Infectious salmon anemia virus
- Infectious spleen and kidney necrosis virus
- Influenza A virus
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- Influenza B virus
- Influenza C virus
- Influenza virus (unspecified)
- Influenzavirus (unspecified)
- Influenzavirus A
- Influenzavirus B
- Influenzavirus C
- Influenzavirus D
- Influenzavirus pr8
- Insect iridescent virus
- Insect virus
- Interfering virus
- Invertebrate iridescent virus 1
- Invertebrate iridescent virus 3
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- Invertebrate iridescent virus 6
- Iotapapillomavirus 1
- Ipomoea yellow vein virus
- Ippy virus
- Iresine viroid 1
- Iridovirus
- Iris fulva mosaic virus
- Iris mild mosaic virus
- Iris severe mosaic virus
- Irkut virus
- Isfahan virus
- Isla Vista virus
- Israel turkey meningoencephalomyelitis virus
- Israeli acute paralysis virus
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