Senator Barnes may refer to:
Charles N. Barnes (1860–1932), Illinois State Senate Clark Barnes (born 1950), West Virginia State Senate Henson P. Barnes (1934–2015), North Carolina State Senate John Barnes (Australian politician) (1868–1938), Senate of Australia John R. Barnes (1833–1919), Utah State Senate John Barnes Jr. (born 1931), New Hampshire State Senate Julius Steele Barnes (1792–1870), Connecticut State Senate Monica Barnes (1936–2018), Senate of Ireland Peter J. Barnes III (born 1956), New Jersey State Senate Roy Barnes (born 1948), Georgia State Senate Stan Barnes (politician) (born 1961), Arizona State Senate Tim Barnes (politician) (born 1958), Tennessee State Senate Tina Rose Muña Barnes (born 1962), Senate of Guam William D. Barnes (1856–1927), New York State Senate