Louisa MacGregor Rix (born 2 February 1955) is a British film and television actress.

The daughter of the farce actor Sir Brian Rix and actress Elspet Gray, she played the character of 'Kevin's Mum' (with Harry Enfield's Kevin) on television and in the film Kevin & Perry Go Large (2000). Rix also played Mel Smith's girlfriend in the British sitcom Colin's Sandwich (1988-90) and the Home Secretary in The Execution of Gary Glitter.