Club Ninja is the tenth studio album by American rock band Blue Öyster Cult, released on December 10, 1985, in the United Kingdom and on February 11, 1986, in the United States. The album was intended as a comeback for the band, whose previous album The Revölution by Night failed to attain Gold status following the success of 1981's Fire of Unknown Origin and 1982's Extraterrestrial Live. Club Ninja sold more than 175,000 copies, falling well short of gold status again, and because of its high cost, Columbia Records executives deemed it a commercial failure. The album was re-issued on compact disc on March 10, 2009, by Sony-owned reissue label American Beat Records, which had also reissued the band's 1988 album, Imaginos.

Blue Öyster Cult is an American hard rock band formed on Long Island in Stony Brook, New York, in 1967. The band has sold 25 million records worldwide, including 7 million in the United States. The band's fusion of hard rock with psychedelia, and penchant for occult, fantastical and tongue-in-cheek lyrics, had a major influence on heavy metal music. They developed a cult following and, while achieving mainstream hits like "(Don't Fear) The Reaper" (1976) and "Burnin' for You" (1981), their commercial success was limited. Both songs, and others such as "Godzilla" (1977), remain classic rock radio staples. The band were early adopters of the music video format, and their videos received heavy rotation on MTV in its early period.