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- Rakdos (Magic: the Gathering)
- Ramuthra (Jonathan Stroud, Bartimaeus Trilogy)
- Red Guy (Cow and Chicken)
- Retriever (Dungeons & Dragons fantasy game)
- Randall Flagg (Stephen King, The Stand and other works)
- Rias Gregmory (High School DxD)
- Rock Demons The Edge Chronicles
- Ronove (Umineko no Naku Koro Ni)
- Rosier (Karen Chance, The Cassandra Palmer series)
- Rubicante (Dante's Inferno)
- Ruby (Supernatural)
- Rufio the Magnificent (Dungeons & Dragons fantasy game)
Read more about this topic: List Of Fictional Demons