| Thomas Swinarton | |
| Office1: | Ontario MPP |
| Term Start1: | 1867 |
| Term End1: | 1871 |
| Predecessor1: | Riding established |
| Successor1: | George McManus |
| Constituency1: | Cardwell |
| Party: | Conservative |
| Birth Date: | 21 May 1821 |
| Birth Place: | County Down, Northern Ireland |
| Death Place: | Bolton, Ontario |
| Occupation: | Businessman |
Thomas Swinarton (May 21, 1821 - December 21, 1893) was an Ontario businessman and political figure. He represented Cardwell in the Legislative Assembly of Ontario from 1867 to 1871 as a Conservative.
Swinarton came to Upper Canada from County Down, Ireland. He served as reeve of Albion Township for 9 years and lived in Coventry. He was also warden for Peel County in 1881. Swinarton operated a gristmill, carding mill and sawmill, as well as a tannery and general store. He defeated George McManus in 1867 when he was elected in Cardwell.