Jonny Quest (also known as The Adventures of Jonny Quest) is an American animated science fiction adventure television series about a boy who accompanies his scientist father on extraordinary adventures. It was produced by Hanna-Barbera Productions for Screen Gems, and was created and designed by the late comic book artist Doug Wildey.

The show was inspired by radio serials and comics in the action-adventure genre, and featured more realistic art, human characters, and stories than Hanna-Barbera's previous cartoon programs. It was the first of several Hanna-Barbera action-based adventure shows—which would later include Space Ghost, The Herculoids, and Birdman and the Galaxy Trio—and ran on ABC in prime time on early Friday nights for one season from 1964 to 1965.

After 20 years of reruns, during which time the series appeared on all three major U.S. television networks of the time, new episodes were produced for syndication in 1986 as part of The Funtastic World of Hanna-Barbera's second season. Two telefilms, a comic book series, and a second revival series, The Real Adventures of Jonny Quest, were produced in the 1990s. Characters from the series also appear throughout The Venture Bros., which was developed as a parody of it.