| Abbreviations | Meaning |
 | KMPV | Kammavanpettai Virus |
 | KMV | Killed Measles Virus Vaccine |
 | KNRK | Kirsten Sarcoma Virus In Normal Rat Kidney |
 | KOKV | Kokobera Virus |
 | KOLV | Kolongo Virus |
 | KOOLV | Koolpinyah Virus |
 | KOOV | Koongol Virus |
 | KOTV | Kotonkan Virus |
 | KOUV | Koutango Virus |
 | KOWV | Kowanyama Virus |
 | KPV | Kangaroo Poxvirus; Key Process Variable; Killed Parenteral Vaccine; Killed Polio Vaccine |
 | KPYV | Kilham Polyomavirus |
 | KRIV | Kairi Virus |
 | KRV | Kilham Rat Virus |
 | KSHV | Kaposi Sarcoma-associated Herpesvirus |
 | KSIV | Karshi Virus |
 | KSOV | Kaisodi Virus |
 | KSV | Kao Shuan Virus |
 | KTRV | Keterah Virus |
 | KTSV | Kalanchoe Top-spotting Virus |
 | KUN | Kunjin [virus] |
 | KUNV | Kunjin Virus |
 | KV | Kanamycin And Vancomycin; Kidney Vacuolating Virus; Killed Vaccine |
 | KWAV | Kwatta Virus |
 | LAC | La Crosse [virus] |
 | LACV | La Crosse Virus |
 | LAHV | Leukocyte-associated Herpesvirus |
 | LALV | Lucerne Australian Latent Virus |
 | LANV | Laguna Negra Virus; Left Atrial Neovascularization |
 | LASV | Lassa Virus |
 | LAV | Liquid-assisted Ventilation; Lymphadenopathy-associated Virus |
 | LBV | Lagos Bat Virus; Left Brachial Vein; Lung Blood Volume |
 | LCDV | Lymphocystis Disease Virus |
 | LCMV | Lymphocytic Choriomeningitis Virus |
 | LCUV | Leaf Curl Virus |
 | LCV | Lake Clarendon Virus; Lecithovitellin; Leukocytoclastic Vasculitis; Lymphocytic Choriomeningitis Virus |
 | LDCPV | Lymantria Dispar Cypovirus |
 | LDV | Le Dantec Virus |
 | LDV | Lactate Dehydrogenase-elevating Virus, Lactic Dehydrogenase Virus |
 | LDV | Lordsdale Virus |
 | LEAV | Leanyer Virus |
 | LEBV | Lebombo Virus |
 | LEDV | Lednice Virus |
 | LFV | Large Field Of View; Lassa Fever Virus; Low-frequency Ventilation |
 | LGTV | Langat Virus |
 | LIPV | Left Inferior Pulmonary Vein; Lipovnik Virus |
 | LIV | Left Innominate Vein; Louping Ill Virus |
 | LJAV | Landjia Virus |
 | LJNV | Lanjan Virus |
 | LJV | La Joya Virus |