James Henry Cassidy (October 28, 1869 – August 23, 1926) was an American lawyer and politician who served as a U.S. Representative from Ohio for one term from 1909 to 1911.

Born in Cleveland, Ohio, Cassidy attended public schools.

Cassidy subsequently served as clerk of the Committee on Rivers and Harbors, House of Representatives, from December 1901 until January 11, 1909, when he resigned.

James H. Cassidy was elected as a Republican to the Sixty-first Congress to fill the vacancy caused by the resignation of Theodore E. Burton, where he served from April 20, 1909 to March 3, 1911.

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