Calvin Bellamy, better known as Coo Coo Cal, is an American rapper from Milwaukee, WI. He is perhaps best known for his number-one rap single "My Projects".

Coo Coo Cal's first album, Walkin' Dead was released independently in 1999. Tommy Boy Records released Cal's second 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 fourth album, All or Nothin', followed in 2004.