Peacemaker is an American superhero television series created by James Gunn for the streaming service HBO Max, based on the DC Comics character of the same name. It 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, the series further explores jingoistic mercenary Christopher Smith / Peacemaker. It is produced by the Safran Company and Troll Court Entertainment in association with Warner Bros. Television, with Gunn serving as showrunner.

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 all eight episodes while completing the film during the COVID-19 pandemic. HBO Max ordered Peacemaker straight-to-series in September 2020, and additional casting took place over the following months. Filming began in Vancouver, Canada, in January 2021, with Gunn directing five episodes. Production ended in July. Gunn chose to use hair metal songs for the series' soundtrack, including "Do Ya Wanna Taste It" by Wig Wam for the opening titles; the title sequence features the series' cast performing a choreographed dance number.

Peacemaker premiered on HBO Max on January 13, 2022, with its first three episodes. The rest of the series was released weekly until February 17. Each episode received higher viewership than the last, with the season finale breaking the record for highest single day viewership of an HBO Max original episode. The series has received positive reviews, with praise going to Cena's performance and Gunn's directing and writing. A second season was ordered in February 2022, and will be integrated with Gunn's new DC Universe (DCU). Work on a spin-off series, Waller, has also begun as part of the DCU.