James Garland "J.G." Quintel (born September 13, 1982) is an American animator, television writer, and voice actor. He voices Mordecai and Hi Five Ghost on Cartoon Network series Regular Show, which he also created, and the HBO Max series, Close Enough. He also was the creative director for The Marvelous Misadventures of Flapjack, an animated series that appeared on television from June 2008 to August 2010, and a writer on Camp Lazlo from 2005-2008.

In December 2009, ASIFA-Hollywood nominated Quintel for an Annie Award in the category of "Directing in a Television Production" for his directing work on an episode of The Marvelous Misadventures of Flapjack. In September 2011, the Academy of Television Arts & Sciences nominated Quintel for a Primetime Emmy Award in the Outstanding Short-format Animated Program category for Regular Show. He most recently works for Cartoon Network Studios in Burbank, California developing episodes for Regular Show.

In 2017, it was announced that TBS has picked up a new animated series by Quintel, entitled Close Enough, a co-production of Cartoon Network Studios with the newly-established Studio T, which was later revealed to premiere on HBO Max.

On June 12, 2024, the Annecy International Animation Film Festival announced a new Regular Show series, titled Regular Show: The Lost Tapes, with Quintel returning as showrunner, which premiered on Cartoon Network.

On June 14, 2024, the Annecy International Animation Film Festival announced that Quintel will also serve as showrunner for a TV series adaption of Jillian Tamaki's comic book series SuperMutant Magic Academy, which will premiere on Adult Swim.