Mackenzie Rio Davis (born April 1, 1987)^[2] is a Canadian actress. She made her feature film debut in the drama film Smashed (2012). In 2013, she appeared in the film The F Word, for which she received a Canadian Screen Award nomination for Best Supporting Actress. From 2014 to 2017, she starred as computer programmer Cameron Howe in the AMC period drama series Halt and Catch Fire.

Davis co-starred as Yorkie in the Emmy Award-winning Black Mirror episode "San Junipero", for which she received critical acclaim. She appeared in the films The Martian (2015), Blade Runner 2049 (2017), and portrayed the title character in the comedy-drama film Tully (2018). She then starred as the augmented super-soldier Grace in Terminator: Dark Fate (2019), and co-starred in the comedy film Happiest Season (2020). In 2021, she had a lead role in the miniseries Station Eleven, which earned her a Critics' Choice Super Award for Best Actress in a Science Fiction/Fantasy Series.

Davis was born in Vancouver, British Columbia, to Lotte, a graphic designer, and John Davis, a hairdresser from Liverpool, England.^[3] Her parents own AG Hair. She graduated from Collingwood School in West Vancouver in 2005 and then attended McGill University in Montreal, Quebec. She went on to study acting at the Neighborhood Playhouse in New York City.^[4][5]

Davis's first feature film was Smashed. In 2015, she appeared in The Martian as NASA satellite communications engineer Mindy Park.

From 2014 to 2017, she played programming prodigy Cameron Howe in Halt and Catch Fire for the duration of its four-season run.^[6][7]

In 2016, she co-starred as Yorkie in "San Junipero", an episode of the anthology series Black Mirror, which received two Emmy Awards.^[8] She was also cast as Mariette in Blade Runner 2049.^[9]

In 2019, she appeared as one of the new characters in Terminator: Dark Fate, where she portrayed an augmented super soldier who is sent from the future to protect Dani Ramos. In October 2019, she was cast in the lead role in the HBO Max miniseries Station Eleven.^[10]

In 2020, Davis starred as Kate in The Turning, opposite Finn Wolfhard and Brooklynn Prince. The film is a modern adaptation of the 1898 horror novella The Turn of the Screw by Henry James. She also starred as Diana Hastings in Irresistible, a film by Jon Stewart about the outsized influence of money on the American electoral system. She also starred in the 2020 romantic comedy Happiest Season co-starring Kristen Stewart.^[11][12][13]

In June 2020, it was announced that Davis would be part of the ensemble cast of Zellner Brothers' science-fiction comedy Alpha Gang, which includes Jon Hamm, Andrea Riseborough, Nicholas Hoult, Sofia Boutella and Steven Yeun.^[14]

In February to April 2023 she played the role of Isolde in Phaedra in an updated version by Simon Stone at the National Theatre in London.

Her short film WOACA, her directorial debut, screened in the Short Cuts program at the 2023 Toronto International Film Festival.^[15]

In May 2022, she signed to star in Justin Anderson’s directorial debut Swimming Home, an adaptation of the Booker Prize-nominated novel of the same name by Deborah Levy, alongside Christopher Abbott and Ariane Labed.^[16]