Sarah Doon Mackichan is a British actress, comedian and writer. She was a co-creator, writer and performer on the Emmy Award-winning series Smack the Pony. She frequently collaborates with Armando Iannucci and Steve Coogan, playing numerous characters in The Day Today, Brass Eye and Alan Partridge, and has also appeared in Toast of London and Two Doors Down.

Mackichan was nominated for a BAFTA TV Award for Best Female Comedy Performance in 2014 for her role in the series Plebs and received critical acclaim for her role alongside John Malkovich in the play Bitter Wheat in 2019.