Trivia

Great-grandfather Tim Mara founded the New York Giants. Great-grandfather Art Rooney founded the Pittsburgh Steelers.

Younger sister of Kate Mara. Cousin of John Mara Jr..

Has one child: son River (born September 2020) with fiance Joaquin Phoenix. The boy is named after his late uncle, actor River Phoenix.

Uncle John Mara is CEO of the New York Giants since 2005.

Several sources, including Vogue and Entertainment Weekly, reported that the piercings (including multiple ear, eyebrow, and nipple piercings) that Rooney Mara sports, as Lisbeth Salander, in The Girl with the Dragon Tattoo (2011) were real, not cosmetic simulations. Mara got the piercings in a series of sessions in Brooklyn and Sweden.

Her favorite actors are Cate Blanchett, Marion Cotillard and Daniel Day-Lewis.

Rooney Mara founded the non-profit organization Faces of Kibera. It provides housing, food, and medical care for orphans in Kibera, a slum in Nairobi, Kenya. The charity's goal is to build an orphanage in the region, for which six acres of land have been purchased. The charity auctions memorabilia from the Steelers and Giants, as well as training camp events on eBay to raise money.

Began dating Joaquin Phoenix on the set of Mary Magdalene (2018).

Announced her engagement to actor Joaquin Phoenix on July 21, 2019.

Considers Gena Rowlands to be her favorite actress and A Woman Under the Influence (1974) to be her favorite film.

She hated working on A Nightmare on Elm Street (2010) so much that she seriously considered giving up acting as a result.

Learned to play the guitar for her role in the romantic drama Song to Song (2017).

Mara is pronounced mair-a, not mahr-a.

Rooney and her sister Kate Mara both appeared in Best Picture Oscar nominated films in 2011. Rooney was in The Social Network (2010), Kate in 127 Hours (2010).

She hated A Nightmare on Elm Street (2010) and her performance in the horror remake.

Great-granddaughter of Art Rooney.

She was originally cast as Maya Hansen in Zero Dark Thirty (2012) but dropped out to do Side Effects (2013) and was replaced by Jessica Chastain.

Great-uncle Dan Rooney was the US Ambassador to Ireland from 2009 to 2012.

Attended and graduated with a degree from New York University (2010).

Daughter of Timothy Christopher Mara, a scout for the New York Giants and Kathleen McNulty, née Rooney.

Returned to work 9 months after giving birth to her son River to begin filming Women Talking (2022).

Granddaughter of Wellington Mara and Timothy Rooney.

Good friends with Brie Larson.

She has appeared in five films that have been nominated for the Best Picture Oscar: The Social Network (2010), Her (2013), Lion (2016), Nightmare Alley (2021) and Women Talking (2022).

She and actor Joaquin Phoenix have a son together named River, after Phoenix's late brother.

In an interview with W Magazine in 2016, she told that her favorite love scene is the one between Marion Cotillard and Matthias Schoenaerts in Rust and Bone (2012).

Her paternal grandfather was of Irish descent and her paternal grandmother was of half German, as well as of French-Canadian and Irish, ancestry. Her mother is of Irish and Italian descent.

Was in a long-term relationship with Charlie McDowell from 2010 to 2016.

Turned down the role of Estella in Great Expectations (2012). Holliday Grainger was eventually cast.

Voted #3 on Ask men's top 99 "most desirable" women of 2012.

Sister-in-law of Jamie Bell.

Attended and graduated from Fox Lane High School in Bedford, New York (2003).

She has appeared in one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: The Social Network (2010).

Born on the same date as Luke Mitchell.