Abby O’Sullivan is the costume designer of films including Frozen River, Sinister, Dark Harvest (MGM / Amazon), Mississippi Grind (A24), The Map of Tiny Perfect Things, and Gifted (FilmNation). She has designed a wide range of projects—from grounded character dramas to supernatural and post-apocalyptic worlds—often collaborating with SFX, prosthetic, and creature teams to create integrated, performance-ready builds.

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She has designed for studios including A24, MGM, Amazon, and the BBC. A dual citizen of the U.S. and Ireland (EU), Abby works throughout Europe and the United States.

contact@abbyosullivan.com