- Abaca bract mosaic virus
- Abaca bunchy top virus
- Abaca mosiac virus
- Abelson murine leukemia virus
- Abelson's virus
- Abutilon mosaic virus
- Abutilon yellows virus
- Acanthamoeba polyphaga mimivirus
- Acanthocystis turfacea chlorella virus 1
- Acara virus
- Acholeplasma phage L2
- Acholeplasma phage MV-L51
- Acidianus bottle-shaped virus
- Acidianus rod-shaped virus 1
- Acidianus two-tailed virus
- Acinetobacter phage 133
- Acipenserid herpesvirus 2
- Aconitum latent virus
- Acrobasis zelleri entomopoxvirus 'L'
- Actinomyces phage Av-1
- Acute bee paralysis virus
- Acute laryngotracheobronchitis virus
- Adelaide River virus
- Adeno associated virus group
- Adenoviridae
- Adenovirus
- Adoxophyes honmai nucleopolyhedrovirus
- Adoxophyes orana granulovirus
- Aedes aegypti densovirus
- Aedes aegypti entomopoxvirus
- Aedes aegypti Mosqcopia virus
- Aedes albopictus densovirus
- Aedes pseudoscutellaris reovirus
- Aeromonas phage 25
- Aeromonas phage 31
- Aeromonas phage 43
- Aeromonas phage 44RR2.8t
- Aeromonas phage 65
- Aeromonas phage Aeh1
- Aeromonas phage phiO18P
- Aeropyrum pernix bacilliform virus 1
- African cassava mosaic virus
- African green monkey polyomavirus
- African green monkey simian foamy virus
- African horse sickness virus
- African oil palm ringspot virus
- African swine fever virus
- Agaricus bisporus virus 4
- Ageratum enation virus
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- Ageratum leaf curl virus
- Ageratum yellow vein Hualian virus
- Ageratum yellow vein Sri Lanka virus
- Ageratum yellow vein virus
- Aglaonema bacilliform virus
- Agropyron mosaic virus
- Agrotis ipsilon multiple nucleopolyhedrovirus
- Ahlum waterborne virus
- Aichi virus
- AIDS virus
- Akabane virus
- Alajuela virus
- Alcelaphine herpesvirus 1
- Alcelaphine herpesvirus 2
- Aleutian mink disease parvovirus
- Aleutian mink disease virus
- Alfalfa cryptic virus 1
- Alfalfa mosaic virus
- Algerian watermelon mosaic virus
- Alligatorweed stunting virus
- Allpahuayo virus
- Alpharetrovirus
- Alphavirus
- Alpinia mosaic virus
- Alstroemeria mosaic virus
- Alstroemeria virus X
- Alternanthera mild mosaic virus
- Alternanthera mosaic virus
- Alternanthera yellow vein virus
- ALV related virus
- Amapari virus
- Amaranthus leaf mottle virus
- Amazon lily mosaic virus
- Ambystoma tigrinum virus
- American hop latent virus
- American plum line pattern virus
- Amsacta moorei entomopoxvirus 'L'
- Anagyris vein yellowing virus
- Anatid herpesvirus 1
- Andean potato latent virus
- Andean potato mottle virus
- Andes virus
- Angelica virus Y
- Angelonia flower break virus
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- Anguillid herpesvirus 1
- Anomala cuprea entomopoxvirus
- Anopheles A virus
- Anopheles B virus
- Anopheles gambiae Moose virus
- Antheraea eucalypti virus
- Anthoxanthum latent blanching virus
- Anthriscus yellows virus
- Anticarsia gemmatalis multiple nucleopolyhedrovirus
- Apanteles crassicornis bracovirus
- Apanteles fumiferanae bracovirus
- Aphid lethal paralysis virus
- Aphodius tasmaniae entomopoxvirus
- Aphthovirus
- Apium virus Y
- Apoi virus
- Apple chlorotic leaf spot virus
- Apple dimple fruit viroid
- Apple latent spherical virus
- Apple mosaic virus
- Apple scar skin viroid
- Apple stem grooving virus
- Apple stem pitting virus
- Apricot latent ringspot virus
- Apricot latent virus
- Apricot pseudo-chlorotic leaf spot virus
- Aquareovirus
- Aquareovirus A
- Aquareovirus B
- Aquareovirus C
- Aquareovirus D
- Aquareovirus E
- Aquareovirus F
- Aquareovirus G
- Arabidopsis thaliana Art1 virus
- Arabidopsis thaliana Athila virus
- Arabidopsis thaliana AtRE1 virus
- Arabidopsis thaliana Endovir virus
- Arabidopsis thaliana Evelknievel virus
- Arabidopsis thaliana Ta1 virus
- Arabidopsis thaliana Tat4 virus
- Arabis mosaic virus
- Araujia mosaic virus
- Aravan virus
- Arbovirus
- Arbovirus C
- Arbovirus group A
- Arbovirus group B
- Arenavirus group
- Argentine hemorrhagic fever virus
- Argentinian hemorrhagic fever virus
- Aroa virus
- Arphia conspersa entomopoxvirus 'O'
- Arracacha mottle virus
- Arracacha virus A
- Arterivirus
- Artichoke Aegean ringspot virus
- Artichoke Italian latent virus
- Artichoke latent virus
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- Artichoke mottled crinkle virus
- Artichoke yellow ringspot virus
- Artogeia rapae granulovirus
- Ascaris lumbricoides Tas virus
- Ascogaster argentifrons bracovirus
- Ascogaster quadridentata bracovirus
- Asparagus virus 1
- Asparagus virus 2
- Asparagus virus 3
- Aspergillus ochraceous virus
- Astrovirus
- Ateline herpesvirus 1
- Ateline herpesvirus 2
- Ateline herpesvirus 3
- Ateline herpesvirus group
- Atkinsonella hypoxylon virus
- Atlantic salmon paramyxovirus
- Aujezky's disease virus
- Aura virus
- Aurantiochytrium single-stranded RNA virus 01
- Australian bat lyssavirus
- Australian grapevine viroid
- Autographa californica multiple nucleopolyhedrovirus
- Aviadenovirus
- Avian adeno-associated virus
- Avian carcinoma Mill Hill virus 2
- Avian coronavirus
- Avian encephalomyelitis virus
- Avian erythroblastosis virus
- Avian hepatitis E virus
- Avian infectious bronchitis virus
- Avian leukemia virus
- Avian leukosis virus
- Avian lymphomatosis virus
- Avian metapneumovirus
- Avian myeloblastosis virus
- Avian myelocytomatosis virus 29
- Avian orthoreovirus
- Avian paramyxovirus
- Avian pneumoencephalitis virus
- Avian reticuloendotheliosis virus
- Avian sapelovirus
- Avian sarcoma virus
- Avian sarcoma virus CT10
- Avian type C retrovirus group
- Avihepadnavirus
- Avipoxvirus
- Avocado sunblotch viroid
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