Joseph Warren Keifer (January 30, 1836 – April 22, 1932) was a major general during the Spanish–American War and a prominent U.S. politician during the 1880s. He served in the United States House of Representatives as a Republican from Ohio from 1877 to 1885 and from 1905 to 1911. From 1881 to 1883, he was also Speaker of the House.