Joan Cooper (23 August 1922 – 1 July 1989) was a British actress.

Her husband was the actor Arthur Lowe whom she met at the Manchester Repertory Theatre in 1946. They were married at the Register Office, Strand, London, in January 1948. She had two children – David Gatehouse (a son from a previous marriage) and Stephen Lowe (born 1953 at Hammersmith, London, UK).

She had some minor roles alongside him, particularly playing Private Godfrey's sister Dolly in some episodes of Dad's Army.

Lowe died in April 1982, and five years later she moved to his parents' cottage in Hayfield, Derbyshire, which had been vacant since his mother's death in 1981. Joan Cooper lived there until her death from stomach cancer two years later at the age of 66.