Ace in the Hole is a slang expression meaning a secret or extra asset to assure success, referring to the ace playing card a player has as a hole card (or face down card) in a game of stud poker. References to this expression include:
- "Ace in the Hole", a 1909 Tin Pan Alley popular song by James Dempsey and George Mitchell
- Ace in the Hole (film), a film made in 1951 starring Kirk Douglas
- "Ace in the Hole (Cole Porter song)", a song by Cole Porter.
- "Ace in the Hole", a 1979 song by Paul Simon.
- "Ace in the Hole", a song by George Strait
- "Ace in the Hole", song by Bunk Johnson & Lu Watters
- "Ace in the Hole", song by Dave Van Ronk
- "Ace in the Hole", song by Jan Menzies
- "Ace in the Hole", song by Bob Scobey
- "Ace in the Hole", song by Dukes of Dixieland
