Martha MacIsaac (born October 11, 1984) is a Canadian actress. She has appeared in several feature films, including Superbad (2007), The Last House on the Left (2009), Dead Before Dawn (2012), and, most recently, Battle of the Sexes (2017). She has also worked in television and as a voice actress. MacIsaac was born and raised in Charlottetown, Prince Edward Island, the youngest of three girls; her mother Irene was one of twelve. MacIsaac started her career playing Emily Byrd Starr in the Emily of New Moon television series, based on the books by Lucy Maud Montgomery. She has appeared in several plays including the 2006 play The Wild Duck in which she played Hedwig and was nominated for a Dora Mavor Moore Award for "Outstanding Performance by a Female in a Principal Role - Play". In 2009, she played Paige in a remake of the Wes Craven film The Last House on the Left. She also performed in three consecutive productions of Soulpepper Theatre Company's Our Town as Emily, beginning in 2006. In a 2007 Entertainment Weekly article, she stated she has been inspired by Julia Roberts from the age of four and was self-described as "obsessed". She also stated she would like to perform alongside her in a film, particularly "a female version of Twins". In late 2012, MacIsaac began a main role on the NBC comedy 1600 Penn as the president's eldest daughter, Becca. Brittany Snow was originally cast as Becca but because she did not physically resemble and fit in well with the other family members, Martha MacIsaac was cast. In a 2012 interview with the CBC Radio series Island Morning, she revealed that 1600 Penn was her last audition before she considered returning to Canada.

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