Susan Cooley Fargo (August 27, 1942 – November 15, 2019) was an American politician from the state of Massachusetts. She was elected to the 5th Middlesex District in the Massachusetts State Senate in 1997, and later elected to the 3rd Middlesex District in 2003. Prior to serving in the Massachusetts legislature, she was a public management professional who served on the Lincoln Board of Selectmen and the Middlesex executive committee.