The fourth season of the television sitcom Brooklyn Nine-Nine premiered September 20, 2016 on Fox and ended May 23, 2017 with 22 episodes.

Brooklyn Nine-Nine is an American police procedural comedy television series that aired on Fox, and later on NBC, from September 17, 2013 to September 16, 2021, for eight seasons and 153 episodes. Created by Dan Goor and Michael Schur, it revolves around seven New York City Police Department (NYPD) detectives who are adjusting to life under their new commanding officer, the serious and stern Captain Raymond Holt. This sitcom features an ensemble cast of Andre Braugher, Andy Samberg, Stephanie Beatriz, Terry Crews, Melissa Fumero, Joe Lo Truglio, Chelsea Peretti, Dirk Blocker, and Joel McKinnon Miller.