John Alexander Key (December 30, 1871 – March 4, 1954) was an American politician who served as a U.S. representative from Ohio for three terms from 1913 to 1919.

Born in Marion, Ohio, Key attended the public schools.

He served as chairman of the Committee on Pensions (Sixty-third through Sixty-fifth Congresses).

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

This article about a member of the United States House of Representatives from Ohio is a stub.