Adel is an unincorporated community in southeastern Lake County, in the U.S. state of Oregon. The community is in an arid, sparsely populated part of the state, along Oregon Route 140, about 30 miles (48 km) east of Lakeview. The Warner Valley surrounding Adel contains many marshes and shallow lakes, most of them intermittent.

Lake County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 8,160. Its county seat is Lakeview. The county is named after the many lakes found within its boundaries, including Lake Abert, Summer Lake, Hart Lake, and Goose Lake.