| Théodore Legault | |
| Birth Date: | 26 July 1886 |
| Birth Place: | Wendover, Ontario |
| Office1: | Ontario MPP |
| Term Start1: | 1934 |
| Term End1: | 1935 |
| Predecessor1: | Charles Robert Harrison |
| Successor1: | Joseph Marceau |
| Constituency1: | Nipissing |
| Term Start2: | 1926 |
| Term End2: | 1929 |
| Predecessor2: | Zotique Mageau |
| Successor2: | Albert Zenophile Aubin |
| Constituency2: | Sturgeon Falls |
| Spouse: | Estelle Bourdon |
Théodore Legault (July 26, 1886 - January 17, 1935) was an Ontario merchant and political figure. He represented Sturgeon Falls in the Legislative Assembly of Ontario from 1926 to 1929 as an Independent-Liberal and then Nipissing as a Liberal member from 1934 until his death in 1935.
He was born in Wendover, Ontario, the son of Hormidas Legault. In 1912, he married Estelle Bourdon. He served as mayor of Sturgeon Falls in 1922 and was president of the local Board of Trade. Legault was also a member of the Knights of Columbus.