Kristen Thomson (born 1966) is a Canadian actress and playwright.

Thomson was born in Toronto, Ontario. She is known for her one-woman play I, Claudia, which was adapted to film in 2004. In that play and film, Thomson plays all of the roles, using masks to change character.

Thomson received her undergraduate training and University of Toronto's theatre school "University College Drama Program" currently under the tutelage of former Artistic Director of Factory Theatre's Ken Gass.

In 2003, Thomson won an ACTRA Award for her performance in I Shout Love (2001), a short film directed by Sarah Polley. She has also won three Dora Awards for her stage work. Her most recent win was for the Genie Award for Best Performance by an Actress in a Supporting Role in the movie Away From Her.