Science fiction fandom or SF fandom is a community or fandom of people interested in science fiction in contact with one another based upon that interest.

The furry fandom is a subculture interested in anthropomorphic animal characters.

DreamWorks Animation's Shrek franchise, based on William Steig's book of the same name, has an underground Internet fandom that started around 2009.

the community of fans of the Harry Potter books and films who participate in entertainment activities that revolve around the series, such as reading and writing fan fiction, creating and soliciting fan art, engaging in role-playing games, socialising on Harry Potter-based forums, and more.

an international, informal community of fans of the stories by Arthur Conan Doyle featuring the fictional detective Sherlock Holmes.

The fandom also spun-out other enterprises.

The anime and manga fandom traces back to the 1970s and has an international reach.

an international, informal community of fans of the works of J. R. R. Tolkien, especially of the Middle-earth legendarium which includes The Hobbit, The Lord of the Rings, and The Silmarillion.

In South Korea, fandom culture has largely formed around K-pop idols and Korean dramas.