Catherine Anne O'Hara OC (born March 4, 1954) is a Canadian-American actress, writer, and comedian. She first drew notice as an actress in 1974 as a member of The Second City improvisational comedy troupe in Toronto. She landed her first significant television role in 1975 starring opposite John Candy and Dan Aykroyd in the main cast of the Canadian sitcom Coming Up Rosie (1975–1978). The following year, she and Candy began work on the sketch comedy series Second City Television (1976–84), where she drew critical acclaim for both her work as a comedic actress and writer, winning a Primetime Emmy Award for Outstanding Writing for a Variety Series in 1981.
For Nickelodeon, she played Justice Strauss in Lemony Snicket's A Series of Unfortunate Events.