| Office 1 | Ontario MPP |
|---|---|
| Term start 1 | 1963 |
| Term end 1 | 1971 |
| Predecessor 1 | Rhéal Bélisle |
| Successor 1 | Floyd Laughren |
| Constituency 1 | Nickel Belt |
| Party | Progressive Conservative |
| Birth date | November 23, 1935 |
| Death date | February 7, 2004 (aged 68) |
| Death place | Sudbury, Ontario, Canada |
| Occupation | Stock broker, real estate investor |
| Spouse | Doreen nee McDonald Demers |
Gaston Joseph Clément Demers (November 23, 1935 – February 7, 2004) was a politician in Ontario, Canada. He was a Progressive Conservative member of the Legislative Assembly of Ontario from 1963 to 1971 who represented the northern Ontario riding of Nickel Belt.
Before entering politics, Demers had worked as a journalist for the North Bay Nugget and as a town clerk in Chelmsford.
After leaving politics, he served on the boards of FedNor and of Sudbury's Laurentian Hospital, and was a key lobbyist behind the creation of Collège Boréal.