Senator Cahill may refer to:

Máiría Cahill (born 1981), Seanad Éireann (Senate of Ireland) Meg Burton Cahill (born 1954), Arizona State Senate Pamela Cahill (fl. 1980s–2000s), Maine State Senate Pierce Cahill (1869–1935), South Dakota State Senate Terry H. Cahal (1802–1851), Tennessee State Senate