| Saint-Prosper | |
| Settlement Type: | Municipality |
| Motto: | Corde Potius Quam Vi |
| Pushpin Map: | Canada Southern Quebec |
| Pushpin Map Caption: | Location in southern Quebec |
| Coordinates: | 46.2167°N -99°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Chaudière-Appalaches |
| Subdivision Type3: | RCM |
| Subdivision Name3: | Les Etchemins |
| Established Title1: | Constituted |
| Established Date1: | September 26, 1887 |
| Leader Title: | Mayor |
| Leader Name: | Richard Couët |
| Leader Title1: | Federal riding |
| Leader Name1: | Beauce |
| Leader Title2: | Prov. riding |
| Leader Name2: | Beauce-Sud |
| Leader Title3: | Councillor |
| Leader Name3: | Etienne Guay |
| Area Total Km2: | 134.10 |
| Area Land Km2: | 133.74 |
| Population Total: | 3596 |
| Population As Of: | 2021 |
| Population Density Km2: | 26.9 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 0.2% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 1646 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | G0M 1Y0 |
| Area Code: | 418 and 581 |
| Blank Name: | Highways |
| Blank Info: | |
Saint-Prosper is a municipality in Les Etchemins Regional County Municipality in Quebec, Canada. It is part of the Chaudière-Appalaches region and the population is 3,596 as of 2021. It is named after Reverend Prosper-Marcel Meunier, first priest of the parish. It is sometimes known as Saint-Prosper-de-Dorchester.