Marin Ireland (born August 30, 1979) is an American actress. Known for her theatre and independent film work, The New York Times deemed Ireland "one of the great drama queens of the New York stage". She has received nominations for two Independent Spirit Awards and a Tony Award.

Following minor roles in the Law & Order franchise (2003–2008), Ireland earned praise for starring in Neil LaBute's play Reasons to Be Pretty (2008) and was nominated for the Tony Award for Best Featured Actress in a Play. After appearing in the films Rachel Getting Married (2008) and The Understudy (2008), her starring role in Glass Chin (2014) earned her a nomination for the Independent Spirit Award for Best Supporting Female. She played Julia Bowman in the Amazon Studios series Sneaky Pete (2015–2019).