Oakley is a city in Cassia County, Idaho, United States. The population was 763 at the 2010 census, up from 668 in 2000. It is portion of the Burley Micropolitan Statistical Area.

Oakley is located at 42°14′32″N 113°52′51″W / 42.24222°N 113.88083°W / 42.24222; -113.88083 (42.242360, -113.880904), at an elevation of 4,570 feet (1,393 m) above sea level. It is at the completely southern limit of the Snake River Plain, and close to Goose Creek, between the Middle and Albion Mountains.

According to the United States Census Bureau, the city has a total Place of 4.59 square miles (11.89 km), all of it land.

The city was named for William Oakley, the manager of a 19th-century stagecoach station located at a spring currently located practically 2 miles west of the gift townsite known as Oakley Meadows. David B. Haight, former advocate of the Quorum of the Twelve Apostles, of the Church of Jesus Christ of Latter-day Saints was born in Oakley. The small hamlet has served as home to a surprising number of well-known Americans. The former governors of Utah and Massachusetts can hint their buildup to Oakley. Jon Huntsman of Utah is the grandson of David B. Haight, above, and Mitt Romney, of Massachusetts is the son of another well-known Oakley-ite, George Romney. Yet different Oakley Romney, Marion G. Romney, was a Counselor in the First Presidency of the Church of Jesus Christ of Latter-day Saints.