Susan Yvonne Illston (born 1948) is a San Francisco, California-based judge for the United States District Court for the Northern District of California in the Ninth Judicial Circuit.
Judge Illston was born in Tokyo, Japan. She is a graduate of Duke University (B.A., 1970) and Stanford Law School (J.D., 1973). Prior to her appointment, Illston served in private practice first as an associate, then as a partner at Cotchett, Illston & Pitre in Burlingame, California from 1973 to 1995.
On the unanimous recommendations of Senators Barbara Boxer and Dianne Feinstein, Illston was nominated by President Bill Clinton on January 23, 1995 and confirmed by the Senate on May 25, 1995 by majority voice vote.