| L'Islet | |
| Settlement Type: | Regional county municipality |
| Coordinates: | 47.1°N -128°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Chaudière-Appalaches |
| Established Title: | Effective |
| Established Date: | January 1, 1982 |
| Seat Type: | County seat |
| Seat: | Saint-Jean-Port-Joli |
| Government Type: | Prefecture |
| Leader Title: | Prefect |
| Leader Name: | Réal Laverdière |
| Area Total Km2: | 2,448.50 |
| Area Land Km2: | 2,100.02 |
| Population Total: | 17,798 |
| Population As Of: | 2016 |
| Population Density Km2: | 8.5 |
| Population Blank1 Title: | Change 2011-2016 |
| Population Blank1: | 3.9% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 9,924 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Area Code: | 418 and 581 |
L'Islet is a regional county municipality in the Chaudière-Appalaches region of Quebec, Canada.
The county seat is Saint-Jean-Port-Joli.
There are 14 subdivisions within the RCM:
Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[1]