Stephen J. McCormick (1828–1891) was the mayor of Portland, Oregon, United States from 1859–1860. He was originally from Dublin, Ireland.He worked as a printer and publisher. In 1852, he opened a book shop in Portland, the Franklin Book Store. He was elected as a Multnomah County delegate to the Oregon Constitutional Convention, held in 1857. He also served on the county commission and school board.