Sarah Doon Mackichan (; born 7 August 1962) is a British actress, comedian and writer. She co-wrote and co-starred in the double-Emmy-award-winning sketch comedy series Smack the Pony (1999–2003, 2017). Mackichan frequently collaborates with Chris Morris, Armando Iannucci and Steve Coogan, having played multiple characters in the comedy series The Day Today (1994) and Brass Eye (2001).
