The fourth season of the British-American animated sitcom The Amazing World of Gumball, created by Ben Bocquelet, aired on Cartoon Network in the United States, and was produced by Cartoon Network Development Studio Europe.

The series focuses on the misadventures of Gumball Watterson, a blue 12-year-old cat, along with his adopted brother, Darwin, a goldfish.

Together, they cause mischief among their family, as well as with the wide array of students at Elmore Junior High, where they attend middle school.

The season began filming on January 6, 2015, and ended filming on April 28, 2016.

The season was written by Ben Bocquelet, Louise Coats, Mic Graves, Andrew Jones, Ciaran Murtagh, Joe Parham, Tobi Wilson, Timothy Mills, Richard Preddy, Nathan Auerbach, Daniel Berg, Joe Parham, Mark Evans Ciaran Murtagh, Tom Neenan, Andy Wolton, Oliver Kindeberg, Matt Zeqiri, Phil Whelans, Guillaume Cassuto, Joe Markham, John Sheerman, Rikke Asbjoern, James Hamilton, and James Huntrods, and was storyboarded by Adrian Maganza, Aurelie Charbonnier, Chuck Klein, Wandrille Maunoury, Akis Dimitrakopoulos, Yani Ouabdesselam, and Oliver Hamilton Gumball and Darwin decide to join the senior citizens' crew after determining that they are the most "hardcore" gang in Elmore, but get in over their heads when they think one of them wants their former colleague eliminated for leaving them.