Calvin Bellamy (born July 4, 1970), better known as Coo Coo Cal, is an American rapper and truck driver from Milwaukee, Wisconsin. His single "My Projects" went to #1 on the Billboard Hot Rap Singles chart in 2001.

Coo Coo Cal’s debut album, Game, was released in 1996, on In The Trunk Records. Cal's sophomore album, Walkin' Dead, was released in 1999 on Infinite Recordings. Tommy Boy Records released Cal's third album, Disturbed on September 18, 2001. The album spawned Cal's most successful single to date, "My Projects", which topped the Billboard Hot Rap Singles chart.

After leaving Tommy Boy in 2002, Cal released a follow-up to Walkin' Dead entitled Still Walkin'. A fifth album, All or Nothin', followed in 2004. In 2018, Coo Coo Cal returned to release a new single, "Home", on Tone Struck Entertainment and a tell-all documentary.