| Saint-Onésime-d'Ixworth | |
| Settlement Type: | Municipality |
| Pushpin Map: | Canada Eastern Quebec |
| Pushpin Map Caption: | Location in eastern Quebec. |
| Coordinates: | 47.3°N -125°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Bas-Saint-Laurent |
| Subdivision Type3: | RCM |
| Subdivision Name3: | Kamouraska |
| Established Title1: | Constituted |
| Established Date1: | May 13, 1859 |
| Leader Title: | Mayor |
| Leader Name: | Jacques Dionne |
| 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: | 99.80 |
| Area Land Km2: | 100.95 |
| Area Note: | There is an apparent contradiction between two authoritative sources |
| Population Total: | 559 |
| Population As Of: | 2011 |
| Population Density Km2: | 5.5 |
| Population Blank1 Title: | Pop 2006-2011 |
| Population Blank1: | 3.1% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 308 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | G0R 3W0 |
| Area Code: | 418 and 581 |
| Blank Name: | Highways |
| Blank Info: | No major routes |
Saint-Onésime-d'Ixworth is a municipality in the Canadian province of Quebec, located in the Kamouraska Regional County Municipality.