Margaret Ruth "Maggie" Gyllenhaal (born November 16, 1977) is an American actress.
Gyllenhaal made her screen debut when she began to appear in her father's films. Gyllenhaal achieved recognition in a supporting role in the independent cult film, Donnie Darko (2001). Her breakthrough role was in the sadomasochistic romance, Secretary (2002), for which she received critical acclaim and a Golden Globe nomination.
Gyllenhaal has appeared in an eclectic range of films, including Sherrybaby (2006), for which she was nominated for a Golden Globe; the romantic comedy, Trust The Man (2006); and numerous big-budget films such as World Trade Center (2006) and The Dark Knight (2008). She next starred in the musical-drama, Crazy Heart (2009), for which she was nominated for an Academy Award for Best Supporting Actress. Gyllenhaal has also appeared in such theatrical plays as Closer (2000) as well as in television productions like Strip Search (2004).
Gyllenhaal is the daughter of director Stephen Gyllenhaal and screenwriter Naomi Foner (née Achs) and the older sister of actor Jake Gyllenhaal. Gyllenhaal has been in a relationship with actor Peter Sarsgaard since 2002. In 2006, the two became engaged, and Gyllenhaal gave birth to their daughter, Ramona, on October 3, 2006. On May 2, 2009, she married Sarsgaard in Italy. Their second daughter, Gloria Ray, was born April 19, 2012. Gyllenhaal is a politically active Democrat and, like her brother and parents, supports the American Civil Liberties Union. Prior to the US-led invasion of Iraq she participated in anti-war demonstrations. She is actively involved in human rights, civil liberty, anti-poverty and parent trigger causes.