Joseph Henry O'Neil (March 23, 1853 – February 19, 1935) was a U.S. Representative from Massachusetts.

Born in Fall River, Massachusetts, O'Neil moved with his parents to Boston in 1854.

He served as assistant treasurer of the United States at Boston by appointment of President Cleveland in 1895–1899.

Organized the Federal Trust Co., of Boston, in 1899 and served as its president until 1922, when it merged into the Federal National Bank, and then served as chairman of the board of directors until his death.

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