Mission is an unincorporated community in Umatilla County, Oregon, United States.

For statistical purposes, the United States Census Bureau has defined Mission as a census-designated place (CDP).

According to the United States Census Bureau, the CDP has a total area of 7.6 square miles (20 km2), all land.

There were 336 housing units at an average density of 44.0 per square mile (17.0/km2).

22.1% of all households were made up of individuals, and 10.0% had someone living alone who was 65 years of age or older.