Barney's Great Adventure (also known by its promotional title Barney's Great Adventure: The Movie) is a 1998 musical comedy adventure film based on the children's television series Barney & Friends, featuring Barney the Dinosaur in his first feature-length film. The plot follows Barney, along with three young children named Cody, Abby, and Marcella, as they discover a magical egg in a barn. After learning that the egg is a dream maker, Barney and the gang must return the egg to the barn before it hatches. The film was written by Stephen White, directed by Steve Gomer, produced by Sheryl Leach and Lyrick Studios and released by PolyGram Filmed Entertainment on March 27, 1998, at Radio City Music Hall in New York and worldwide on April 3, 1998, in the United States and Canada at the height of Barney's popularity.

The film received negative reviews from critics and was a box-office bomb, only grossing $12 million against a budget of $15 million. This was the third and final film to be produced by Lyrick Studios before it was acquired by and folded into HIT Entertainment on June 6, 2001. It is also the only theatrical Barney film as all other Barney films were just direct-to-video productions.