Halo is an American military science fiction television series developed by Kyle Killen and Steven Kane for the streaming service Paramount+. Based on the video game franchise created by Bungie and developed by 343 Industries, the series follows a 26th-century war between the United Nations Space Command and the Covenant, a theocratic-military alliance of several alien races determined to eradicate humanity. Pablo Schreiber and Jen Taylor star as Master Chief Petty Officer John-117 and Cortana respectively; the latter reprises her voice role from the video game series.

Development for a Halo television series began in mid-2013. Killen and Kane serve as showrunners for the series' first season, which consists of nine episodes. Filming began in Ontario, Canada, in October 2019, although post-production for the first five episodes was affected due to the COVID-19 pandemic. Filming eventually resumed in Budapest, Hungary, in February 2021. In February 2022, ahead of its premiere, the series was renewed for a second season, set to be headed and executive produced by David Wiener. Filming for the second season began in September 2022, and wrapped in May 2023.

The first season of Halo premiered on March 24, 2022, and ran until May 19. It was met with mostly positive reviews from critics, with praise given for its action scenes, cast, and visual effects but criticism for its derivative writing and alterations from the source material. A second season premiered on February 8, 2024, and ran for eight episodes until March 21. It was met with positive reviews from critics, who declared it to be an improvement over the previous season. In July 2024, the series was canceled after two seasons.