| Saint-Omer | |
| Settlement Type: | Municipality |
| Pushpin Map: | Canada Southern Quebec |
| Pushpin Map Caption: | Location in southern Quebec |
| Coordinates: | 47.05°N -113°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Chaudière-Appalaches |
| Subdivision Type3: | RCM |
| Subdivision Name3: | L'Islet |
| Established Title1: | Constituted |
| Established Date1: | January 1, 1954 |
| Leader Title: | Mayor |
| Leader Name: | Huguette Gauthier-Roy |
| Leader Title1: | Federal riding |
| Leader Name1: | Montmagny—L'Islet— Kamouraska—Rivière- du-Loup |
| Leader Title2: | Prov. riding |
| Leader Name2: | Côte-du-Sud |
| Area Total Km2: | 122.40 |
| Area Land Km2: | 122.44 |
| Area Note: | There is an apparent contradiction between two authoritative sources. |
| Population Total: | 294 |
| Population As Of: | 2021 |
| Population Density Km2: | 2.4 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 6.1% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 203 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | G0R 4R0 |
| Area Code: | 418 and 581 |
| Blank Name: | Highways |
| Blank Info: | No major routes |
Saint-Omer is a municipality in L'Islet Regional County Municipality in the Chaudière-Appalaches region of Quebec, Canada.