Peacemaker is an American superhero television series created by James Gunn for the streaming service HBO Max (later renamed Max), based on the DC Comics character of the same name. The first season is the only DC Extended Universe (DCEU) television series and a spin-off from the 2021 film The Suicide Squad. Set after the events of the film, it further explores jingoistic mercenary Christopher Smith / Peacemaker. It was produced by the Safran Company and Troll Court Entertainment in association with Warner Bros. Television and with Gunn as showrunner. The second season is produced by DC Studios and set in the DC Universe (DCU), a "soft reboot" of the DCEU.

John Cena stars as the title character, reprising his role from The Suicide Squad, with Danielle Brooks, Freddie Stroma, Chukwudi Iwuji, Jennifer Holland, Steve Agee, and Robert Patrick also starring. Gunn conceived Peacemaker after noting Cena's strength as a dramatic actor while filming The Suicide Squad and wrote the first season while finishing the film. HBO Max ordered it straight-to-series in September 2020. Filming took place in Vancouver, Canada, from January to July 2021, with Gunn directing five episodes. He chose to use hair metal songs for the series' soundtrack, including "Do Ya Wanna Taste It" by Wig Wam for the opening titles dance sequence. A second season was ordered in February 2022, with Gunn again writing all episodes. The season was integrated with the DCU after Gunn was named co-CEO of DC Studios. Filming took place at Trilith Studios in Atlanta, Georgia, from April to November 2024.

Peacemaker premiered on HBO Max on January 13, 2022, with its first three episodes. The other five episodes of the first season were released weekly until February 17. Viewership increased with each episode and the season received positive reviews. The second season will premiere on Max on August 21, 2025. The series has been nominated for several awards, including a Primetime Creative Arts Emmy Award. A spin-off series, Waller, is in development as part of the DCU.