Entertainment
- Cassiopéia, a Brazilian CGI film
- Cassiopeia (Battlestar Galactica), a TV character from Battlestar Galactica.
- Cassiopeia, a Champion from the online Battle-Arena game League of Legends.
- Cassiopea (Encantadia), the first Queen of Lireo in the Encantadia fantasy series of GMA Network
- Cassiopeia Black, a pure-blood witch from Harry Potter novels
- Cassiopeia, a tortoise featured in Michael Ende's fantasy book Momo (novel)
- Cassiopeia, the mother of Octavian in The Astonishing Life of Octavian Nothing
- Cassiopeia, a Java version of the game Carcassonne (game)
- Cassiopeia, Queen of the bee colony living in the tree across from Lindesfarne and Fenton in Kevin and Kell comic strip by Bill Holbrook.
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