Andrea Louise Martin (born January 15, 1947) is an American-Canadian actress, singer, author and comedian, best known for her work in the television series SCTV. She has appeared in films such as Black Christmas (1974), Wag the Dog (1997), Hedwig and the Angry Inch (2001), My Big Fat Greek Wedding (2002) and My Big Fat Greek Wedding 2 (2016), and lent her voice to the animated films Anastasia (1997), The Rugrats Movie (1998) and Jimmy Neutron: Boy Genius (2001).

Martin has been equally prolific in the world of theater, winning Tony Awards for both My Favorite Year and the 2013 revival of Pippin. Martin also appeared on Broadway in Candide, Oklahoma!, Fiddler on the Roof, Young Frankenstein, Exit the King and Act One. She has received five nominations for the Tony Award for Best Featured Actress in a Musical, more than any other actress in the award's history. She received her first nomination for the Tony Award for Best Featured Actress in a Play for the 2016 revival of Noises Off.

She also starred as Carol Wendelson on the NBC sitcom Great News.