James W. Flanagan (1805–1887) was a U.S. Senator from Texas from 1870 to 1875. Senator Flanagan may also refer to:
- E. J. Flanagan (1883–1957), Washington State Senate
- Ed Flanagan (politician) (1950–2017), Vermont State Senator
- Jennifer Flanagan, Massachusetts State Senate
- John J. Flanagan (born 1961), New York State Senate