| Sinclair Alexander Whittaker | |
| Constituency Am: | Moose Jaw County |
| Assembly: | Saskatchewan Legislative |
| Term Start: | 1929 |
| Term End: | 1934 |
| Successor: | Thomas Waddell |
| Birth Date: | 1888 |
| Birth Place: | Port Perry, Ontario, Canada |
| Citizenship: | Canada |
| Nationality: | Canadian |
| Party: | Progressive Conservative Party of Saskatchewan |
| Occupation: | Operated general stores |
| Known For: | Briercrest Bible Institute founder/chairman Retail Merchants Association of Saskatchewan chairman |
Sinclair Alexander Whittaker (1888 - July 10, 1974) was a merchant and political figure in Saskatchewan. He represented Moose Jaw County from 1929 to 1934 in the Legislative Assembly of Saskatchewan as a Conservative.
He was born in Port Perry, Ontario and, in 1910, moved to Briercrest, Saskatchewan. He operated a small chain of general stores in the province. Sinclair helped found the Briercrest Bible Institute[1] and served as chairman of the board for the institute. He also was chairman of the Retail Merchants Association of Saskatchewan.[2] He was defeated by Thomas Waddell when he ran for re-election in 1934.[3]