Mackenzie Rio Davis (born April 1, 1987) 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 starred in the Black Mirror episode "San Junipero" in 2016, 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 an augmented super-soldier 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.