| Abbreviations | Meaning |
 | MDV | Marek Disease Virus |
| MEAV | Meaban Virus |
| MEGMV | Megakepasma Mosaic Virus |
| MELV | Melao Virus |
| MESV | Murine Embryonic Stem-cell Virus |
| MEV | Maximum Exercise Ventilation; Mevalonate; Minimal Excursionary Ventilation; Murine Erythroblastosis Virus |
| MEV | Measles Virus; Megaelectron Volts |
| MHV | Magnetic Heart Vector; Middle Hepatic Vein; Mouse Hepatitis Virus; Murine Hepatitis Virus |
| MICV | Micropia Virus |
| MIDV | Middelburg Virus |
| MINV | Minnal Virus |
| MIRV | Mirim Virus |
| MIV | Mosquito Iridescent Virus |
| MLS | Mouse Leukemia Virus |
| MLV | Moloney Leukemia Virus; Mono Lake Virus; Multilaminar Vesicle; Murine Leukemia Virus |
| MLVAR | Amphotropic Receptor For Murine Leukemia Virus |
| MMLV | Moloney Murine Leukemia Virus; Montana Myotis Leukoencephalitis Virus |
| MMTV | Mouse Mammary Tumor Virus |
| MMULV | Moloney Murine Leukemia Virus |
| MNPV | Multiple Nucleopolyhedrovirus |
| MNTBV | Manitoba Virus |
| MNTV | Minatitlan Virus |
| MO-MSV | Moloney Murine Sarcoma Virus |
| MOBV | Methylhydroxy-benzovesamicol; Mobala Virus |
| MOCV | Molluscum Contagiosum Virus |
| MODV | Modoc Virus |
| MOJUV | Moju Virus |
| MOKV | Mokola Virus |
| MOMLV, MO-MLV | Moloney Murine Leukemia Virus |
| MOPV | Monovalent Oral Poliovirus Vaccine; Mopeia Virus |
| MORV | Moriche Virus |
| MOSV | Mossuril Virus |
| MOV | Metal-oxide Varistor; Minimal Occlusive Volume; Molluscum-like Poxvirus |
| MOV | Mottle Virus |
| MPKV | Maprik Virus |
| MPLV | Myeloproliferative Leukemia Virus |
| MPMV, M-PMV | Mason-Pfizer Monkey Virus |
| MPOV | M'Poko Virus |
| MPRV | Mapuera Virus |
| MPSV | Myeloproliferative Sarcoma Virus |
| MPV | Micromonas Pusilla Virus |
| MPXV | Monkeypox Virus |
| MQOV | Mosqueiro Virus |
| MRD | Measles-rindenpest-distemper [virus Group] |
| MRV | Magnetic Resonance Venography; Mammalian Orthoreovirus; Minute Respiratory Volume; Mitchell River Virus; Mixed Respiratory Vaccine |
| MRVI | Mixed Virus Respiratory Infection |
| MSGV | Mouse Salivary Gland Virus |
| MSPV | Malpais Spring Virus |
| MSV | Master Seed Virus |
| MSV | Moloney Sarcoma Virus |
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