Barbie and the Diamond Castle is a 2008 Canadian direct-to-video computer-animated friendship musical film and the 13th entry in the Barbie film series. The film features the voice of Kelly Sheridan as Barbie. It is the third musical in the series.

Songs for the film were written by Amy Powers, Guy Roche, Russ DeSalvo, Gabriel Mann, Megan Cavallari and Jeannie Lurie along with executive producer Rob Hundnut. "Connected", the main song, was sung by Katharine McPhee.

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