Mission is a city in the Lower Mainland of the province of British Columbia, Canada. It was originally incorporated as a district municipality in 1892, growing to include additional villages and rural areas over the years, adding the original Town of Mission City, long an independent core of the region, in 1969. It is bordered by the city of Abbotsford to the south and the city of Maple Ridge to the west. To the east are the unincorporated areas of Hatzic and Dewdney.

The Lower Mainland is a geographic and cultural region of the mainland coast of British Columbia that generally comprises the regional districts of Metro Vancouver and the Fraser Valley. Home to approximately 3.05 million people as of the 2021 Canadian census, the Lower Mainland contains sixteen of the province's 30 most populous municipalities and approximately 60% of the province's total population.