Cathryn Harrison (born May 29, 1959) is an English actress. Her most notable performances include Lily in Black Moon as well as many made-for-television movies including Portrait of a Marriage. She began her career in Robert Altman's Images and after two decades of low roles, started a career in British television and radio dramas.

Granddaughter of Rex Harrison.

Father is Noel Harrison (I); grandfather is Rex Harrison (I).

Sister of Harriet Harrison and Simon Harrison (I)