Jonny Quest
Johnny Quest
Genre Animation
Science Fiction
Created by Doug Wildey
Written by William D. Hamilton
Walter Black
Creative director(s) William Hanna
Joseph Barbera
Starring Tam Matheson
Mike Road
Danny Bravo
John Stephenson
Don Messick
Country of origin United States
Language(s) English
No. of seasons 1
No. of episodes 26 (List of Jonny Quest episodes)
Executive producer(s) William Hanna
Joseph Barbera
Running time 25 minutes
Composer(s) Hoyt Curtin
Production company(s) Hanna-Barbera Productions
Original channel ABC
First shown September 18, 1964
Original run September 18, 1964 – March 11, 1965

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 created and designed by comic book artist Doug Wildey.

Inspired by radio serials and comics in the action-adventure genre, it featured more realistic art, 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 GhostThe Herculoids, and Birdman and the Galaxy Trio – and ran on ABC in prime time on early Friday nights for one season in 1964–1965.

After spending two decades in reruns, during which time it appeared on all three major US 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 more modern revival series, The Real Adventures of Jonny Quest, were produced in the 1990s.

The series aired re-runs on Boomerang from the channel's launch on April 1, 2000 until June 1, 2014.