| Frank S. Cahill | |
| Smallimage: | Frank S. Cahill.jpg |
| Constituency Mp: | Pontiac |
| Parliament: | Canadian |
| Predecessor: | Gerald Hugh Brabazon |
| Successor: | Charles Bélec |
| Term Start: | 1917 |
| Term End: | 1930 |
| Birth Date: | 27 January 1876 |
| Birth Place: | Calumet Island, Quebec, Canada |
| Death Place: | Campbell's Bay, Quebec |
| Nationality: | British subject |
| Spouse: | Mildred Coyne |
| Party: | Liberal Party (1911-1930), Laurier Liberals (1917-1921) |
| Occupation: | broker, clerk, real estate broker |
Frank S. Cahill (27 January 1876, in Calumet Island, Quebec - 17 April 1934), was a politician, broker, clerk and real estate broker.
The son of William Cahill, he was educated in Campbell's Bay, Quebec. Cahill worked as a postal clerk in Sault Ste. Marie, Michigan for several years, then moved to Saskatchewan, working as a real estate broker in Saskatoon. In 1909, he opened another real estate office in Ottawa. Cahill married Mildred Coyne in 1910.[1]
He was elected to the House of Commons of Canada as a Member of the Liberal Party (Laurier Liberal) caucus in the 1917 election to represent the riding of Pontiac. He was re-elected in 1921, 1925 and 1926 then defeated in 1930.