| Saint-Théophile | |
| Settlement Type: | Municipality |
| Pushpin Map: | Canada Southern Quebec |
| Pushpin Map Caption: | Location in southern Quebec. |
| Coordinates: | 45.9333°N -99°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Chaudière-Appalaches |
| Subdivision Type3: | RCM |
| Subdivision Name3: | Beauce-Sartigan |
| Established Title1: | Constituted |
| Established Date1: | June 28, 1975 |
| Leader Title: | Mayor |
| Leader Name: | Roland Boucher |
| Leader Title1: | Federal riding |
| Leader Name1: | Beauce |
| Leader Title2: | Prov. riding |
| Leader Name2: | Beauce-Sud |
| Area Total Km2: | 436.90 |
| Area Land Km2: | 427.78 |
| Population Total: | 702 |
| Population As Of: | 2021 |
| Population Density Km2: | 1.6 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 1.5% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 354 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | G0M 2A0 |
| Area Code: | 418 and 581 |
| Blank Name: | Highways |
| Blank Info: | |
Saint-Théophile (pronounced as /fr/) is a municipality in the Municipalité régionale de comté de Beauce-Sartigan in Quebec, Canada on the Canada–United States border. It is part of the Chaudière-Appalaches region and the population is 702 as of 2021. It is named after reverend Théophile Montminy, who had been chosen by the archdiocese to find a proper location for a church.
Saint-Théophile lies next to the border with Maine, and there is a border crossing on Route 173 within the municipality, in the hamlet of Armstrong. The Armstrong custom office is the third in importance in Quebec.