Joseph M. McCormick (1877–1925) was a U.S. Senator from Illinois from 1919 to 1925.
Senator McCormick may also refer to:
- Dale McCormick (born 1947), Maine State Senate
- Earle McCormick, Maine State Senate
- George M. McCormick (1841–1913), Illinois State Senate
- James Robinson McCormick (1824–1897), Missouri State Senate
- John McCormick (British politician) (1887/1888–1958), Northern Irish Senate