Stephen Geyer Porter (May 18, 1869 – June 27, 1930) was a Republican member of the U.S. House of Representatives from Pennsylvania.

Porter was elected as a Republican to the Sixty-second and to the nine succeeding Congresses and served until his death.

He was the Chairman of the United States House Committee on Foreign Affairs during the Sixty-sixth through Seventy-first Congresses.

The American delegation's proposals for more stringent drug control were rejected.

Porter also served as chairman of the House Committee on Foreign Affairs, in which capacity he drafted the "Porter Resolution", passed by the House, which authorized the president to place the United States' relations with China on a footing of equality.