Vieux Fort (also known as Old Fort) is an unconstituted locality within the municipality of Bonne-Espérance in the Côte-Nord region of Quebec, Canada. It is also known as Old Fort Bay or Vieux-Fort (the latter is preferred by the Commission de toponymie du Québec).
In the 2021 Census of Population conducted by Statistics Canada, Old Fort had a population of 256 living in 106 of its 113 total private dwellings, a change of from its 2016 population of 234. With a land area of , it had a population density of in 2021.
Commission scolaire du Littoral operates Mountain Ridge School (anglophone) in Old Fort.