Susan P. Thomases (born 1944) is a New York-based attorney. She served as personal counsel and an informal adviser to Hillary Clinton during the presidency of Bill Clinton. She was a prominent witness during the Senate Whitewater Hearings in 1995. She served as the model for the character Lucille Kaufmann from the 1996 political novel "Primary Colors".
Susan P. Thomases served as a witness at the age of 51.