Fred and Barney Meet the Thing is an American animated package show and a spin-off of The Flintstones produced by Hanna-Barbera which aired on NBC from September 8, 1979, to December 1, 1979.

Despite the show's title, the two segments remained separate and did not crossover with one another. The characters of Fred Flintstone, Barney Rubble and Thing were only featured together during the opening title sequence and in brief bumpers between segments. The segments featuring Fred and Barney were episodes of The New Fred and Barney Show while The Thing was an unrelated new series co-produced with Marvel Comics. The actual idea for the series came from then NBC President Fred Silverman who originated the concept for a series involving a "boy with a magic ring", and told Hanna-Barbera it needed a recognizable "celebrated attraction". As Hanna-Barbera had a relationship with Marvel producing comics off their IPs the company was able to negotiate for the likeness of The Thing.

For the 1979–80 season, the series was expanded to a 90-minute timeslot with the addition of The New Shmoo episodes and broadcast under the new title Fred and Barney Meet the Shmoo.

For the following 1980-81 season, both The Thing and Shmoo segments would be removed in favor of The Flintstone Comedy Show.

Like many animated series created by Hanna-Barbera in the 1970s, the show contained a laugh track, one of their last productions to do so.