The Flintstones: On the Rocks is a 2001 American animated made-for-television comedy film featuring characters from The Flintstones franchise. Co-directed by Chris Savino and David Smith, it was dedicated to Hoyt Curtin (longtime Hanna-Barbera conductor and composer) and William Hanna (creator of The Flintstones and founder of Hanna-Barbera Productions with partner Joseph Barbera). It premiered on November 3, 2001 on Cartoon Network. In addition to the show's traditional animation style, the film also utilizes stop-motion animation.

It is the only Flintstones production by Cartoon Network Studios after Hanna-Barbera was absorbed into Warner Bros. Animation on March 12, 2001 (Warner Bros. later re-acquired Cartoon Network Studios from Turner Broadcasting System, reuniting Cartoon Network Studios with Warner Bros. Animation, on March 4, 2019). In format, the film was intended to emulate the first two seasons of the 1960s series, distinctly more mature and aimed at older audiences than later seasons, and therefore chose to focus more on the relationships between the original core cast of Fred, Barney, Wilma and Betty. The Rubbles are prompted to take Fred and Wilma to Rockapulco for their anniversary vacation, in an attempt to rekindle their troubled marriage. However, while there, Fred and Wilma both find themselves tempted in other directions.

Since its original broadcast, On the Rocks has not been released on home video, though bootleg copies exist via various sources.