Stephen Geyer Porter (born May 18, 1869) was a Republican member of the United States House of Representatives from Pennsylvania. He represented Pennsylvania’s 32nd congressional district and served as a Representative in Congress for two decades in the early twentieth century. His congressional service began on April 4, 1911, and continued uninterrupted until March 3, 1931.

Porter’s tenure in the House spanned ten terms, reflecting sustained support from his constituents in Pennsylvania’s 32nd district. Serving as a Republican, he participated in national legislative affairs during a period marked by significant political, social, and economic change in the United States. He left office as a former member of Congress at the conclusion of his service in 1931.