| Abbreviations | Meaning |
 | MSV | Monkey Sarcoma Virus |
 | MSV | Muir Springs Virus |
 | MSV | Murine Sarcoma Virus |
 | MTBV | Marituba Virus |
 | MTRV | Matruh Virus |
 | MTV | Mammary Tumor Virus |
 | MTV | Mibuna Temperate Virus |
 | MTV | Mild Tigre Virus |
 | MTV | Mouse Mammary Tumor Virus |
 | MUCV | Mucambo Virus |
 | MUDV | Mudjinbarry Virus |
 | MUHV | Murid Herpesvirus |
 | MULV | Muleshoe Virus |
 | MULV, MULV | Murine Leukemia Virus |
 | MUMTV | Murine Mammary Tumor Virus |
 | MUNV | Munguba Virus |
 | MURV | Murre Virus; Murutucu Virus |
 | MUV | Mumps Virus |
 | MV | Measles Virus |
 | MV | Microvirus, Microvirus |
 | MV | Minute Virus |
 | MV | Mosaic Virus |
 | MV | Mottle Virus |
 | MV | Myeloblastosis Virus |
 | MVA | Modified Vaccinia Virus Ankara |
 | MVC | Minute Virus Of Canines |
 | MVEV | Murray Valley Encephalitis Virus |
 | MVM | Microvillose Membrane; Minute Virus Of Mice |
 | MWAV | Manawa Virus |
 | MWV | Manawatu Virus |
 | MXV | Mexico Virus |
 | MYKV | Mykines Virus |
 | MYXV | Myxoma Virus |
 | NA | Non-A [hepatitis Virus] |
 | NAHV | Non-A Hepatitis Virus |
 | NANBHV | Non-A, Non-B Hepatitis Virus |
 | NANBNC | Non-A, Non-B, Non-C [hepatitis Virus] |
 | NASV | Nasoule Virus |
 | NBV | Nelson Bay Orthoreovirus |
 | NCDV | Nebraska Calf Diarrhea Virus |
 | NCHECR | National Centre In Human Immunodeficiency Virus [HIV] Epidemiology And Clinical Research [Australia] |
 | NDEV | Ndelle Virus |
 | NDUV | Ndumu Virus |
 | NDV | Newcastle Disease Virus; Nyando Virus |
 | NEDV | North End Virus |
 | NEPV | Nepuyo Virus |
 | NETV | Netivot Virus |
 | NGAV | Ngaingan Virus |
 | NGOV | Ngoupe Virus |
 | NIV | Nodule-inducing Virus; Noninvasive Ventilation |