James H. Slater (1826–1899) was a U.S. Senator from Oregon from 1879 to 1885. Senator Slater may also refer to:
Fred J. Slater (1885–1943), New York State Senate George A. Slater (1867–1937), New York State Senate Samuel S. Slater (1870–1916), New York State Senate Tom Slater (politician) (1945–2018), Iowa State Senate