Senator Day may refer to:
Albert R. Day (1861–1924), Maine State Senate Ann Day (1938–2016), Arizona State Senate Arthur H. Day (1890–1967), Ohio State Senate Charles W. Day (1836–1906), Wisconsin State Senate Clint Day (born 1959), Georgia State Senate Connie Day (Nebraska politician) (1949–2001), Nebraska State Senate Dick Day (born 1937), Minnesota State Senate Frank A. Day (1855–1928), Minnesota State Senate Jen Day (born 1981), Nebraska State Senate L. B. Day (1932–1986), Oregon State Senate Luther Day (1813–1885), Ohio State Senate Theodore D. Day (1917–2003), New York State Senate William S. Day (1923–1984), Washington State Senate
See also Rita Heard Days (born 1950), Missouri State Senate