John Hanson Farquhar (December 20, 1818 – October 1, 1873) was an American lawyer and politician who served one term as a U.S. Representative from Indiana from 1865 to 1867.

Born in Union Bridge, Maryland, Farquhar attended the public schools.

He was then admitted to the bar where he commenced practice in Brookville, Indiana.

He served as captain in the Nineteenth Infantry of the Regular Army in the Civil War.

This article incorporates public domain material from the Biographical Directory of the United States Congress