West River is a rural municipality in the Canadian province of Prince Edward Island within Queens County.
The Municipality of West River was originally incorporated in 1974. It incorporated as a rural municipality on January 1, 2018. On September 1, 2020, the Rural Municipality of West River amalgamated with the rural municipalities of Afton, Bonshaw, Meadowbank, and New Haven-Riverdale. The amalgamated municipality was named the Rural Municipality of West River.
Prior to the amalgamation, localities within West River included Canoe Cove, Long Creek, New Argyle, and St. Catherines.
In the 2021 Census of Population conducted by Statistics Canada, West River had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.