The ninth season of The Walking Dead, an American post-apocalyptic horror television series on AMC premiered on October 7, 2018, and concluded on March 31, 2019, consisting of 16 episodes. Developed for television by Frank Darabont, the series is based on the eponymous series of comic books by Robert Kirkman, Tony Moore, and Charlie Adlard. The executive producers are Kirkman, David Alpert, Scott M. Gimple, Angela Kang, Greg Nicotero, Tom Luse, Denise Huth, and Gale Anne Hurd, with Kang taking over the role of showrunner from Gimple.

This season adapts material from issues #127-144 of the comic book series and focuses on the aftermath of All Out War. Eighteen months after the defeat of Negan (Jeffrey Dean Morgan) under an alliance of communities spearheaded by Rick Grimes (Andrew Lincoln), the season focuses on the united communities as they face obstacles and dangers both outside and inside their alliance, with the threat of the mysterious Whisperers looming.

The ninth season is the final season for lead actor Andrew Lincoln, who has portrayed Rick Grimes since the series' first season. Lauren Cohan, who portrayed Maggie Greene since the second season, only appeared in the first five episodes of this season due to other commitments.