- M'Poko virus
- Macacine herpesvirus 1
- Macacine herpesvirus 3
- Macacine herpesvirus 4
- Macacine herpesvirus 5
- Macaque simian foamy virus
- Machupo virus
- Maclura mosaic virus
- Macropodid herpesvirus 1
- Macropodid herpesvirus 2
- Macroptilium mosaic Puerto Rico virus
- Macroptilium yellow mosaic Florida virus
- Macroptilium yellow mosaic virus
- Mad itch virus
- Madrid virus
- Magnaporthe oryzae virus 1
- Main Drain virus
- Maize chlorotic dwarf virus
- Maize chlorotic mottle virus
- Maize dwarf mosaic virus
- Maize fine streak virus
- Maize Iranian mosaic virus
- Maize mosaic virus
- Maize necrotic streak virus
- Maize rayado fino virus
- Maize rough dwarf virus
- Maize streak virus
- Maize stripe virus
- Maize white line mosaic virus
- Mal de Rio Cuarto virus
- Malva mosaic virus
- Malva vein clearing virus
- Malvastrum leaf curl Guangdong virus
- Malvastrum leaf curl virus
- Malvastrum yellow leaf curl virus
- Malvastrum yellow mosaic virus
- Malvastrum yellow vein virus
- Malvastrum yellow vein Yunnan virus
- Mamastrovirus 1
- Mamastrovirus 2
- Mamastrovirus 3
- Mamastrovirus 4
- Mamastrovirus 5
- Mamastrovirus 6
- Mamastrovirus 7
- Mamastrovirus 8
- Mamastrovirus 9
- Mamastrovirus 10
- Mamastrovirus 11
- Mamastrovirus 12
- Mamastrovirus 13
- Mamastrovirus 14
- Mamastrovirus 15
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- Mamastrovirus 16
- Mamastrovirus 17
- Mamastrovirus 18
- Mamastrovirus 19
- Mamestra brassicae multiple nucleopolyhedrovirus
- Mamestra configurata nucleopolyhedrovirus A
- Mamestra configurata nucleopolyhedrovirus B
- Mammalian orthoreovirus
- Mammalian type B oncovirus group
- Mammalian type B retroviruses
- Mammalian type C retrovirus group
- Mammalian type D retroviruses
- Mammary tumor virus
- Mannheimia phage phiMhaA1-PHL101
- Manzanilla virus
- Mapuera virus
- Maraba virus
- Marafivirus
- Marburg marburgvirus
- Marburg virus
- Marburg-like virus
- Marituba virus
- Marmosetpox virus (MPV)
- Mason Pfizer monkey virus
- Mason-Pfizer monkey virus
- Mastadenovirus
- Mayaro virus
- ME virus
- Meaban virus
- Meadow saffron breaking virus
- Measles virus
- Megakepasma mosaic virus
- Melandrium yellow fleck virus
- Melanoplus sanguinipes entomopoxvirus 'O'
- Meleagrid herpesvirus 1
- Melolontha melolontha entomopoxvirus
- Melon aphid-borne yellows virus
- Melon chlorotic leaf curl virus
- Melon mild mottle virus
- Melon necrotic spot virus
- Melon rugose mosaic virus
- Melon yellowing-associated virus
- Menangle virus
- Mengo virus
- Mengovirus
- Merkel cell polyomavirus
- Merremia mosaic virus
- Mesta yellow vein mosaic virus
- Methanobacterium phage psiM1
- Mexican papita viroid
- Microcystis aeruginosa phage Ma-LMM01
- Micromonas pusilla reovirus
- Micromonas pusilla virus SP1
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- Microplitis croceipes bracovirus
- Microplitis demolitor bracovirus
- Middelburg virus
- Milk vetch dwarf virus
- Milkers nodule virus
- Mimosa yellow leaf curl virus
- Minatitlan virus
- Miniopterus bat coronavirus 1
- Miniopterus bat coronavirus HKU8
- Mink enteritis virus
- Mint vein banding-associated virus
- Mint virus 1
- Mint virus 2
- Mint virus X
- Minute virus of mice
- Mirabilis mosaic virus
- Mirafiori lettuce big-vein virus
- Miscanthus streak virus
- MLV related virus
- MM virus
- Mobala virus
- Modoc virus
- Mokola virus
- Molluscipoxvirus
- Molluscum contagiosum virus
- Molluscum-like pox virus (MOV)
- Moloney murine sarcoma virus
- Monkey B virus
- Monkeypox virus
- Mononegavirales
- Montana myotis leukoencephalitis virus
- Mopeia virus
- Morbillivirus
- Moroccan pepper virus
- Moroccan watermelon mosaic virus
- Mosso das Pedras virus (78V3531)
- Mount Elgon bat virus
- Mouse cytomegalovirus
- Mouse encephalomyelitis virus
- Mouse hepatitis virus
- Mouse K virus
- Mouse leukemia virus
- Mouse mammary tumor virus
- Mouse minute virus
- Mouse parvovirus 1
- Mouse pneumonia virus
- Mouse poliomyelitis virus
- Mouse polyomavirus
- Mouse sarcoma virus
- Mousepox virus
- Moussa virus
- Mozambique virus
- Mucambo virus
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- Mucosal disease virus
- Mud crab virus
- Mulberry latent virus
- Mulberry ringspot virus
- Mule deerpox virus (DPV)
- Muleshoe virus
- Mumps virus
- Mungbean yellow mosaic India virus
- Mungbean yellow mosaic virus
- Munia coronavirus HKU13
- Mupapillomavirus 1
- Mupapillomavirus 2
- Murid betaherpesvirus 1
- Murid cytomegalovirus 2
- Murid herpesvirus 1
- Murid herpesvirus 2
- Murid herpesvirus 4
- Murid herpesvirus 7
- Murid herpesvirus 8
- Murine adenovirus A
- Murine adenovirus B
- Murine adenovirus C
- Murine coronavirus
- Murine cytomegalovirus group
- Murine encephalomyelitis virus
- Murine hepatitis virus
- Murine leukemia virus
- Murine nodule inducing virus
- Murine pneumonia virus
- Murine pneumotropic virus
- Murine polyomavirus
- Murine sarcoma virus
- Muromegalovirus
- Murray Valley encephalitis virus
- Musca hytrovirus
- Mushroom bacilliform virus
- Muskmelon vein necrosis virus
- Mustelid herpesvirus 1
- Mycobacterium phage D29
- Mycobacterium phage I3
- Mycobacterium phage L5
- Mycoplasma phage P1
- Mycoreovirus 1
- Mycoreovirus 2
- Mycoreovirus 3
- Mynahpox virus
- Myriotrichia clavaeformis virus a
- Myrobalan latent ringspot virus
- Myxoma virus
- Myxovirus
- Myxovirus multiforme
- Myxovirus parotitidis
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