| Thomas Alfred Thompson | |
| Riding1: | Lanark |
| Parliament1: | Canadian |
| Term Start1: | 1930 |
| Term End1: | 1940 |
| Predecessor1: | William Samuel Murphy |
| Successor1: | Bert Soper |
| Office2: | Ontario MPP |
| Term Start2: | 1923 |
| Term End2: | 1929 |
| Predecessor2: | Hiram McCreary |
| Successor2: | John Alexander Craig |
| Constituency2: | Lanark North |
| Party: | Conservative |
| Birth Date: | 5 August 1868 |
| Birth Place: | Ramsay Township, Ontario, Canada |
| Occupation: | Farmer |
| Spouse: | Elizabeth W. Morris (m.1897) |
Thomas Alfred Thompson (August 5, 1868 - May 12, 1953) was a farmer and political figure in Ontario, Canada. He represented Lanark North in the Legislative Assembly of Ontario from 1923 to 1929 and Lanark in the House of Commons of Canada from 1930 to 1940 as a Conservative member.
He was born in Ramsay Township, Ontario, the son of George Thompson. In 1897, he married Elizabeth W. Morris. He served two years as reeve for the township. He also was a public school trustee and was township clerk and treasurer for 20 years. Thompson ran unsuccessful for a federal seat in 1929. He was unsuccessful in a bid for reelection in 1940.