- Rabbit fibroma virus
- Rabbit hemorrhagic disease virus
- Rabbit kidney vaculolating virus
- Rabbit kidney vacuolating virus
- Rabbit papillomavirus
- Rabbit picobirnavirus
- Rabies virus
- Raccoon parvovirus
- Raccoonpox virus
- Radish leaf curl virus
- Radish mosaic virus
- Radish yellow edge virus
- Ralstonia phage RSA1
- Ranid herpesvirus 1
- Ranid herpesvirus 2
- Ranikhet virus
- Ranunculus latent virus
- Ranunculus leaf distortion virus
- Ranunculus mild mosaic virus
- Ranunculus mosaic virus
- Ranunculus white mottle virus
- Raptor adenovirus A
- Raspberry bushy dwarf virus
- Raspberry leaf mottle virus
- Raspberry ringspot virus
- Rat cytomegalovirus
- Rat parvovirus
- Rat virus
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- Rauscher's virus
- Recombinant vaccinia virus
- Recombinant virus
- Red clover cryptic virus 2
- Red clover mottle virus
- Red clover necrotic mosaic virus
- Red Clover Necrotic Mosaic Virus
- Red clover vein mosaic virus
- Red kangaroo poxvirus
- Redspotted grouper nervous necrosis virus
- Rehmannia mosaic virus
- Reovirus
- Reovirus 1
- Reovirus 2
- Reovirus 3
- Reptilian orthoreovirus
- Reptilian type C virus
- Respiratory infection virus
- Respiratory syncytial virus
- Respiratory virus
- Reston ebolavirus
- Reticuloendotheliosis virus
- Retrovirus
- Rhabdovirus
- Rhabdovirus carpia
- Rhadinovirus
- Rhesus macaque parvovirus
- Rhinolophus bat coronavirus HKU2
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- Rhinovirus
- Rhizidiomyces virus
- Rhizidiovirus
- Rhizoctonia solani virus 717
- Rhizosolenia setigera RNA virus 01
- Rhopalanthe virus Y
- Rhopalosiphum padi virus
- Rhopapillomavirus 1
- Rhynchosia golden mosaic Sinaloa virus
- Rhynchosia golden mosaic virus
- Ribgrass mosaic virus
- Rice black streaked dwarf virus
- Rice dwarf virus
- Rice gall dwarf virus
- Rice grassy stunt virus
- Rice hoja blanca virus
- Rice necrosis mosaic virus
- Rice ragged stunt virus
- Rice stripe virus
- Rice tungro bacilliform virus
- Rice tungro spherical virus
- Rice yellow mottle virus
- Rice yellow stunt virus
- Rift Valley fever virus
- Riley's virus
- Rinderpest virus
- Rio Bravo virus
- Rio Mamore virus
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- Rio Negro virus
- Rio Segundo virus
- RNA tumor virus
- RNA virus
- Rose spring dwarf-associated virus
- Rosellinia necatrix megabirnavirus 1
- Rosellinia necatrix virus 1
- Roseobacter phage SIO1
- Ross River virus
- Rotavirus
- Rotavirus A
- Rotavirus B
- Rotavirus C
- Rotavirus D
- Rotavirus E
- Rougeole virus
- Rous sarcoma virus
- Rousettus bat coronavirus HKU9
- Royal Farm virus
- RT parvovirus
- Rubella virus
- Rubeola virus
- Rubivirus
- Rubus yellow net virus
- Russian autumn encephalitis virus
- Ryegrass cryptic virus
- Ryegrass mosaic virus
- Ryegrass mottle virus
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