Once in a Blue Moon may refer to:
Books
- Once in a Blue Moon (comics), a 2004 graphic novel by Nunzio DeFilippis and Christina Weir
- Once in a Blue Moon (stories), a 2003 story collection by Magnus Mills
Film and television
Film
- Once in a Blue Moon (1935 film), an American film directed by Ben Hecht
- Once in a Blue Moon (1995 film), a Canadian film starring Simon R. Baker
- A secondary title used within Japan for A Ghost of a Chance, the 2011 film directed by Kōki Mitani
TV
- "Once in a Blue Moon" (Charmed), an episode of the television series Charmed
- Once in a Blue Moon: A Celebration of Australian Musicals, a 1994 Australian television special
Music
Albums
- Once in a Blue Moon, a 1958 album by Mabel Mercer
- Once in a Blue Moon (Frankie Miller album), 1973
- Once in a Very Blue Moon, a 1984 album by Nanci Griffith, and its title track
- Once in a Blue Moon (Fool's Garden album), 1993
- Once in a Blue Moon: A Celebration of Australian Musicals, the soundtrack album of the 1994 Australian television special
- Once in a Blue Moon (University of Texas Jazz Orchestra album), 2000
- Once in a Blue Moon (Phil Beer Band album), 2001
- Once in a Blue Moon (Casual Silence album), 2003
Songs
- "Once in a Blue Moon" (song), a 1986 song by Earl Thomas Conley
- "Once in a Blue Moon", a song by Sydney Forest from the soundtrack album Simply Irresistible
See also
- Blue moon, the lunar event responsible for the expression