The Kerberos Saga (ケルベロス・サーガ, Keruberosu saga) is an alternate history political thriller media mix created by the Japanese writer and filmmaker Mamoru Oshii in 1986. The most famous installment of the franchise, especially outside Japan, is the 1999 anime film Jin-Roh: The Wolf Brigade.

The saga is centered on the fictitious Tokyo police Special Armed Garrison whose emblem and nickname is Kerberos (a.k.a. Cerberus), the mythological three-headed watchdog of hell. Before it was officially renamed Kerberos Saga circa 2004, it was known as the "Kerberos series" (ケルベロス・シリーズ, keruberosu shirīzu) or the "Kenrō series" (犬狼・シリーズ, kenrou shirīzu).

The franchise is currently owned by Mamoru Oshii; It consists of works based on Oshii's original story spanning various media including tokusatsu feature films, radio dramas, comic books, animation films and monographs. Licensed products are mainly Special Armed Garrison powered suit based action figures or garage kits called Protect Gears, and Kerberos Saga episodes derived soundtracks, storyboards, and guidebooks. Merchandising includes posters, folding fans, mousepads, statuette busts, tee-shirts, and even bottles of wine with a dedicated online shop available on the official website.

The most famous paraphernalia of the franchise is the Protect Gears, the powered exoskeleton suits worn by members of the Special Armed Garrison. They were designed by mechanical and character designers and RahXephon director Yutaka Izubuchi.