Alexandra J. Byrne is an English costume designer. Much of her career has focused on creating costumes for historical period dramas. These films include Persuasion (1995), Hamlet (1996), Elizabeth (1998), Captain Corelli's Mandolin (2001), Finding Neverland (2004), The Phantom of the Opera (2004), Elizabeth: The Golden Age (2007), and Mary Queen of Scots (2018). Byrne's costume design work has earned her five Oscar nominations, and she won the award for Elizabeth: The Golden Age.