Rosa Cuthbert Guy (/ˈɡiː/) (September 1, 1922 – June 3, 2012) was a Trinidad-born American writer who grew up in the New York metropolitan area. Her family had immigrated and she was orphaned when young. Raised in foster homes, she later was acclaimed for her books of fiction for adults and young people that stressed supportive relationships.

Guy lived and worked in New York City, where she was among the founders of the Harlem Writers Guild in 1950. It was highly influential in encouraging African-American writers to gain publication and had a high rate of success. Guy died of cancer on June 3, 2012.