Saint-Prosper (French pronunciation: [sɛ̃ pʁɔspɛʁ]) is a municipality in Les Etchemins Regional County Municipality in Quebec, Canada.

It is part of the Chaudière-Appalaches region and the population is 3,596 as of 2021.

It is named after Reverend Prosper-Marcel Meunier, first priest of the parish.

It is sometimes known as Saint-Prosper-de-Dorchester.