Montague is a community within the Town of Three Rivers in Kings County, Prince Edward Island, Canada. Previously incorporated as a town, it amalgamated with the Town of Georgetown, the rural municipalities of Brudenell, Cardigan, Lorne Valley, Lower Montague, and Valleyfield, and portions of three adjacent unincorporated areas in 2018. Montague is the largest population centre in the county and straddles the Montague River which is the dividing line between the townships of Lot 52 and Lot 59.