The Great Diamond Robbery is a 1954 American comedy film directed by Robert Z. Leonard and starring Red Skelton, James Whitmore, Cara Williams and Reginald Owen.

On a park bench, Ambrose explains to a stranger that he places a newspaper ad once a year, on his birthday, and sits here hoping to be reunited with the parents who abandoned him in this very spot as an infant.

A couple of con artists become involved, with nightclub dancer Maggie Drumman and her mother Emily hired to pretend to be Ambrose's real sister and mom.

After the crooks try to steal the diamond, Ambrose accidentally cuts it in half, perfectly.

According to MGM records the movie earned $501,000 in the US and Canada and $201,000 elsewhere, making a loss to the studio of $426,000.