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 15 kilometres (9.3 mi) 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.