Senator Williamson may refer to:
Ben M. Williamson (1864–1941), U.S. Senator from Kentucky from 1930 to 1931 George Williamson (Florida politician) (1938–2010), Florida State Senate James Allen Williamson (born 1951), Oklahoma State Senate John N. Williamson (1855–1943), Oregon State Senate Joseph Williamson (Maine politician) (1789–1854), Maine State Senate Norris C. Williamson (1874–1949), Louisiana State Senate Pliny W. Williamson (1876–1958), New York State Senate Robert McAlpin Williamson (1804–1859), Republic of Texas Senate and Texas State Senate Rollin S. Williamson (1839–1889), Illinois State Senate William D. Williamson (1779–1846), Massachusetts State Senate