George R. Dennis (1822–1882) was a U.S. Senator from Maryland from 1873 to 1879, and also served in the Maryland State Senate. Senator Dennis or Denis may also refer to:
Elias Smith Dennis (1812–1894), Illinois State Senate John Dennis (Missouri politician) (1917–2000), Missouri State Senate Leonard G. Dennis (died 1885), Florida State Senate Max Dennis (1925–1986), Ohio State Senate Rembert Dennis (1915–1992), South Carolina State Senate William M. Dennis (1810–1882), Wisconsin State Senate
See also Senator Denis (disambiguation)