William Strong (May 6, 1808 – August 19, 1895) was an American lawyer, jurist, and politician who served as an Associate Justice of the Supreme Court of the United States from 1870 to 1880. Strong previously served as a U.S. Representative from Pennsylvania from 1847 to 1851 and as a justice of the Supreme Court of Pennsylvania from 1857 to 1868. He also served on the Commission that adjudicated the disputed presidential election of 1876.