Samuel Abbott Ferrin (January 19, 1831 – March 29, 1875) was a Canadian American, immigrant, medical doctor, and Republican politician. He was a member of the Wisconsin State Assembly, representing Grant County during the 1872 session. He also served as a hospital steward and surgeon in the Union Army during the American Civil War.

Ferrin was born on January 19, 1831, in what is now Saint-Thomas, Quebec. He graduated from Rush Medical College.^[1] During the American Civil War, Ferrin originally enlisted with the 32nd Wisconsin Infantry Regiment of the Union Army. He later became a surgeon in Wingville, Wisconsin^[2] and was commissioned First Assistant Surgeon of the 44th Wisconsin Infantry Regiment.

Ferrin was a member of the Assembly during the 1872 session.^[3] He was a Republican.