Deborah Lynn Scott (born 1954), also known as Deborah Scott, is a costume designer and set designer, best known for her work in James Cameron's directorial venture, Titanic, which won her the Academy Award for Best Costume Design. Scott collaborated with Cameron on his three films in the Avatar film series, earning her second Academy Award nomination for her costume design on Avatar: Fire and Ash.

Her first movie as a costume designer was Don't Answer the Phone (1979). Some of her other movies are E.T. the Extra-Terrestrial (1982), Back to the Future (1985), Legends of the Fall (1994), Wild Wild West (1999), The Patriot (2000), Transformers (2007), Avatar (2009), and Love & Other Drugs (2010). In 2023, she received the Costume Designers Guild Career Achievement Award.

She has also worked as an Assistant costume designer on Shakespeare in Love (1998) and The Young Victoria (2009), and as a Set designer on Alouette, je te plumerai (1989) and Midsummer ( Nat Horne Theatre, New York City, 1990).

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