"Luck Be a Lady" is a song written by Frank Loesser in 1950 and first performed by Robert Alda. The song was featured in the musical Guys and Dolls. The lyrics relate the point of view of a gambler, Sky Masterson, who hopes that he will win a bet, the outcome of which will decide whether or not he is able to save his relationship with the girl of his dreams.

Later, it became a signature song for Frank Sinatra, first released on the compilation Reprise Musical Repertory Theatre and re-released on the album Sinatra '65: The Singer Today. It was released as a duet with Chrissie Hynde on Duets II (1994). The song was also recorded by Barbra Streisand for her album Back to Broadway, and appeared on The L Word's soundtrack in episode 4.06, where it was performed by Brian Setzer. Dee Snider performed it as a duet with Clay Aiken on Snider's 2012 album Dee Does Broadway, while the Cherry Poppin' Daddies recorded a version on their 2014 Rat Pack tribute Please Return the Evening.

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