- Kadam virus
- Kadipiro virus
- Kaeng Khoi virus
- Kairi virus
- Kalanchoë latent virus
- Kalanchoë mosaic virus
- Kalanchoë top-spotting virus
- Kaposi's sarcoma-associated herpesvirus
- Kappapapillomavirus 1
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- Kappapapillomavirus 2
- Kashmir bee virus
- Kedougou virus
- Kemerovo virus
- Kennedya yellow mosaic virus
- Khabarovsk virus
- Khujand virus
- Kilham rat virus
- Kilham's rat virus
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- Kirsten murine sarcoma virus
- Klamath virus
- Kluyvera phage Kvp1
- Kokobera virus
- Kolongo virus
- Konjac mosaic virus
- Koongol virus
- Korean hemorrhagic fever virus
- Koutango virus
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- Kudzu mosaic virus
- Kumba virus
- Kunjin virus
- Kurthia phage 6
- Kyasanur forest disease
- Kyasanur Forest disease virus
- Kyuri green mottle mosaic virus
- Kyzylagach virus
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