Robert F. Wagner (1877–1953) was a US Senator from New York from 1927 to 1949.
Senator Wagner may also refer to:
- David Wagner (judge) (1826–1902), Missouri State Senator from 1862 to 1864
- Frank Wagner (politician) (born 1955), Virginia State Senator from 2001 to 2019
- George D. Wagner (1829–1869), Indiana State Senator from c. 1858
- Jack Wagner (politician) (born 1948), Pennsylvania State Senator from 1994 to 2005
- Joseph Wagner (New York politician) (1853–1932), New York State Senator from 1899 to 1904
- Joseph Wagner (Wisconsin politician) (1809–1896), Wisconsin State Senator from 1872 to 1876
- Michael J. Wagner (1941–2014), Maryland State Senator from 1977 to 1979 and from 1982 to 1994
- Richard Van Wagner (1936–2007), New Jersey State Senator from 1984 to 1991
- Rob Wagner (politician) (born 1973), Oregon State Senator since 2018
- Scott Wagner (born 1955), Pennsylvania State Senator from 2014 to 2018
- Sue Wagner (born 1940), Nevada State Senator from 1981 to 1989
- Thomas M. Wagner (c. 1824 – 1862), South Carolina State Senator
- Webster Wagner (1817–1882), New York State Senator from 1872 to 1882
- William Wagner (philanthropist) (1796–1885), Pennsylvania State Senator