| Saint-Damase-de-L'Islet | |
| Settlement Type: | Municipality |
| Pushpin Map: | Canada Southern Quebec |
| Pushpin Map Caption: | Location in southern Quebec |
| Coordinates: | 47.2°N -78°W |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Quebec |
| Subdivision Type2: | Region |
| Subdivision Name2: | Chaudière-Appalaches |
| Subdivision Type3: | RCM |
| Subdivision Name3: | L'Islet |
| Established Title1: | Constituted |
| Established Date1: | November 9, 1898 |
| Leader Title: | Mayor |
| Leader Name: | Anne Caron |
| 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: | 249.60 |
| Area Land Km2: | 247.64 |
| Population Total: | 563 |
| Population As Of: | 2021 |
| Population Density Km2: | 2.3 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 2.3% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 321 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | G0R 2X0 |
| Blank Name: | Highways |
| Area Code: | 418 and 581 |
Saint-Damase-de-L'Islet is a municipality in Quebec, Canada, with a population of about 600 people nestled in the Appalachian Mountains. It is located about southeast of Saint-Jean-Port-Joli. It is named after the Pope Damasus I and Damase Ouellet (1826–1908), which is known as the pioneer of the town.
The town was first named "Municipalité du canton d'Ashford" in 1898 and got its current name in 1955.
It is known for its local Chicken Festival every September.
Saint-Damase-de-L'Islet is located near the south shore of the upper Estuary of St. Lawrence, in the Côte-du-Sud region, at the eastern border of the municipalities of Saint-Aubert and Saint-Cyrille-de-Lessard. The municipality of L'Islet, to the west, is located nearby.