StrayDog: Kerberos Panzer Cops (ケルベロス 地獄の番犬, Keruberosu: Jigoku no Banken, lit. 'Kerberos: Watchdog of Hell') is a 1991 Japanese science fiction action film written and directed by Mamoru Oshii and starring Shigeru Chiba and Yoshikatsu Fujiki. The second film in the Kerberos Saga and a prequel to 1987's The Red Spectacles, the film follows Inui, a former member of the elite Special Armed Garrison "Kerberos" police tactical unit who, after being arrested following a failed rebellion by his unit, is paroled three years later and travels to Taiwan to search for Koichi Todome, an elite Kerberos member who left Japan.

Unlike The Red Spectacles, StrayDog adopts the setting and theming of Oshii's manga Kerberos Panzer Cop, which established some of the Kerberos Saga's setting and background; however, as the manga was not finished by StrayDog's release, some aspects of the film, such as its time period and details surrounding Kerberos, differ from the events established in the manga by its conclusion in 2000.

StrayDog was released on March 23, 1991 in Japan. An anime film serving as a prequel, Jin-Roh: The Wolf Brigade, was released in 1999, further establishing details about Kerberos and the saga's established setting.