Catherine Martin Luhrmann AC (born 26 January 1965) is an Australian costume designer, production designer, set designer, and film producer, best known for her frequent collaborations with director Baz Luhrmann. She has received numerous accolades, including four Academy Awards, six BAFTA Awards, and a Tony Award. Martin was appointed a Companion of the Order of Australia in 2025.

Martin came to international prominence for providing both the costumes and production design for Strictly Ballroom (1992), Luhrmann's feature directorial debut, which later became the first instalment of the "Red Curtain Trilogy". She won both the Academy Award for Best Costume Designand the Academy Award for Best Production Design for her work on Curtain's final chapter Moulin Rouge! (2001). Martin became just the second woman to win multiple Oscars in a single year (after Edith Head) and the first to do so twice, winning the same two categories for The Great Gatsby (2013). She was also Oscar-nominated for Romeo + Juliet (1996), Australia (2008), and Elvis (2022). Having won four awards out of nine nominations, she holds the record for the most Oscar wins of any Australian.

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