Dewdney, originally named Johnson's Landing from 1884-1892, is an unincorporated community in the Central Fraser Valley of British Columbia, Canada, about 15 km east of the town of Mission. It was incorporated as a district municipality on April 17, 1892, including adjoining areas of Hatzic and Hatzic Island but the anticipated real estate boom on that island didn't pan out and economic damage from the Great Fraser Flood of 1894 led to the municipality's disincorporation on March 12, 1906. Another municipality eastwards, Nicomen, was incorporated in the same year but similarly later disincorporated. Though in the same school district as Mission, it and other adjoining rural areas did not join that municipality when offered.