Marin Yvonne Ireland (born August 30, 1979) is an American actress. Known for her work in theatre and independent films, The New York Times deemed Ireland "one of the great drama queens of the New York stage". Her accolades include a Theatre World Award and nominations for an Independent Spirit Award and a Tony Award.

Following a series of 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).

Ireland's other film roles include the acclaimed productions The Family Fang (2015), Hell or High Water (2016), Piercing (2018), The Miseducation of Cameron Post (2018) and The Irishman (2019). She additionally has played Sissy in the Netflix series The Umbrella Academy (2020–present) and Nora Brady in the Hulu series Y: The Last Man (2021). Her leading role in the horror film The Dark and the Wicked (2020) earned praise.

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