Gretchen Mol (born November 8, 1972) is an American actress and former model. She is known for her roles in the films Rounders, Celebrity, 3:10 to Yuma, The Thirteenth Floor, and The Notorious Bettie Page, in which she played the title character. She also appeared as Gillian Darmody in HBO's Boardwalk Empire.
Mol was born in Deep River, Connecticut, where her mother, Janet (née Morgan), is an artist and teacher, and her father was a school teacher at RHAM. She went to high school with Broadway actor Peter Lockyer, with whom she performed in school musicals and plays. Her brother, Jim Mol, is a director and editor in the film industry. Mol attended The American Musical and Dramatic Academy and graduated from the William Esper Studio. After summer stock in Vermont, she took a job for a while as an usher at Angelika Film Center. She was living in a Hell's Kitchen walk-up when she was noticed by a talent agent who spotted her working as a hat check girl at Michael's Restaurant in New York.