Boise (locally (listen) BOY-see) is the capital and most populous city of the U.S. state of Idaho and is the county seat of Ada County. As of the 2020 census, there were 235,684 people residing in the city. On the Boise River in southwestern Idaho, it is 41 miles (66 km) east of the Oregon border and 110 miles (177 km) north of the Nevada border. The downtown area's elevation is 2,704 feet (824 m) above sea level.

The Boise metropolitan area, also known as the Treasure Valley, includes five counties with a combined population of 749,202, the most populous metropolitan area in Idaho. It contains the state's three largest cities: Boise, Nampa, and Meridian. The Boise–Nampa Metropolitan Statistical Area is the 77th most populous metropolitan statistical area in the United States.

Downtown Boise is the cultural center and home to many small businesses and a number of high-rise buildings. The area has a variety of shops and restaurants. Centrally, 8th Street contains a pedestrian zone with sidewalk cafes and restaurants. The neighborhood has many local restaurants, bars, and boutiques. The area also contains the Basque Block, which showcases Boise's Basque heritage. Downtown Boise's main attractions include the Idaho State Capitol, the classic Egyptian Theatre on the corner of Capitol Boulevard and Main Street, the Boise Art Museum on Capitol in front of Julia Davis Park, and Zoo Boise on the grounds of Julia Davis Park.