Ellen Mirojnick (born 7 July 1949 in New York City) is an American costume designer. She is a frequent collaborator of actor Michael Douglas, having overseen the costume design for the films Fatal Attraction (1987), Wall Street (1987), Basic Instinct (1992), A Perfect Murder (1998), Wall Street: Money Never Sleeps (2010) and Behind the Candelabra (2013). The wardrobe she created for Gordon Gekko's character inspired a fashion trend in the late 1980s and early 1990s for boldly patterned ties, sleek suits, crisp white shirts, and colourful suspenders in men's business wear. She has also been a frequent collaborator of directors Jan de Bont and Paul Verhoeven, acting as costume designer on de Bont's films Speed (1994), Twister (1996) and The Haunting (1999), as well as Verhoeven's films Basic Instinct (1992), Showgirls (1995), Starship Troopers (1997) and Hollow Man (2000).

She won an Emmy and a Costume Designers Guild Award in 2013 for her work on the biopic Behind the Candelabra. In 2016, she was given the Career Achievement Award by the Costume Designers Guild. In 2017, she gained further praise for her work on the biographical musical drama film The Greatest Showman starring Hugh Jackman, which garnered her a nomination for Excellence in Period Film with the Costume Designers Guild. In 2023, Mirojnick received acclaim for her costume design in Christopher Nolan's epic biographical thriller film Oppenheimer, starring Cillian Murphy, Emily Blunt, and Robert Downey Jr., for which Mirojnick received nominations for an Academy Award for Best Costume Design and a BAFTA Award for Best Costume Design.

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