Alexandra Byrne (born 1962) is an English costume designer. Much of her career has focused on creating costumes for period dramas. These films include Persuasion (1995), Hamlet (1996), Elizabeth (1998), Finding Neverland (2004), The Phantom of the Opera (2004), Elizabeth: The Golden Age (2007), Mary Queen of Scots (2018), The Aeronauts (2019), and Emma. (2020).

She has been nominated for the Academy Award for Best Costume Design six times, winning once for Elizabeth: The Golden Age.

Since 2011, Byrne has also designed the costumes for many films in the Marvel Cinematic Universe, including Thor (2011), The Avengers (2012), Guardians of the Galaxy (2014), Avengers: Age of Ultron (2015), Doctor Strange (2016), and The Fantastic Four (2025).

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