| George Prevost McKay | |
| Office1: | Ontario MPP |
| Term Start1: | 1883 |
| Term End1: | 1886 |
| Predecessor1: | William James Parkhill |
| Successor1: | Riding abolished |
| Constituency1: | Simcoe South |
| Party: | Conservative |
| Birth Date: | 7 February 1840 |
| Birth Place: | West Gwillinbury Township, Simcoe County, Upper Canada |
| Death Place: | Toronto, Ontario |
| Occupation: | Businessman |
| Spouse: | Susie Douse |
George Prevost McKay (February 7, 1840 - August 22, 1924) was an Ontario businessman and political figure. He represented Simcoe South in the Legislative Assembly of Ontario as a Conservative member from 1883 to 1886.
McKay was born in West Gwillinbury Township, Simcoe County, Upper Canada in 1840, the son of D. Grant McKay, who came to Upper Canada from New Brunswick. He married Susie Douse and opened one of the first stores in Lefroy. He also served as reeve for Innisfil Township. In 1883, he moved to Toronto, where he worked for the Credit-Foncier Loan Company. He died there in 1924.