The thirteenth floor of a building is often omitted because of superstition.
Thirteenth floor may also refer to:
- The Thirteenth Floor, 1999 science fiction film
- The Thirteenth Floor, 2013 serial in the television series Wizards vs Aliens
- The Thirteenth Floor (comic strip), British comic strip begun in 1984
- "The Tale of the Thirteenth Floor", episode of the television series Are You Afraid of the Dark?
- "A Tale of the Thirteenth Floor", poem by Ogden Nash
- 13th Floor, 2005 Indian film starring Purab Kohli, directed by Luke Kenny
- The 13th Floor, 1995 comic fantasy novel by Sid Fleischman
- The 13th Floor (album), 2009 album by Sirenia
- 13th Floor (album), a 2019 album by Haviah Mighty
- The 13th Floor (1988 film), 1988 horror film starring Miranda Otto
- The 13th Floor Elevators, 1960s band
- The 13th Floor, 1966 Los Angeles band, an edition of The Grass Roots
Floor 13 may refer to:
- Floor 13 (video game), a computer game by Virgin Interactive, released in 1992
- "Floor 13", a song by rapper Machine Gun Kelly from Hotel Diablo