The Prince Who Was a Thief is a 1951 American adventure film directed by Rudolph Mate and starring Tony Curtis and Piper Laurie.

A technicolor swashbuckler, it was the first film Curtis featured in as a star.

In historic Tangiers, an assassin is sent to kill a baby prince, but cannot go through with it.

He decides to raise the child as his own, and he grows up to be a thief.

Life magazine attributed the apocryphal line, "Yonduh lies de castle of de caliph, my fadder" to Curtis in this film.