Nampa (IPA: [næm pə]) is the largest city in Canyon County, Idaho, and the second largest in the state. Only the capital city Boise is larger. As of the 2000 census, Nampa population was 51,867 (2003 estimate: 64,269). Nampa's population has grown by well over 20 percent since 2000, making it one of the fastest-growing cities in Idaho.

Nampa is located 26 miles west of Boise along Interstate 84. The city is considered part of the Boise metropolitan area.

Nobody knows for sure where Nampa got its name. The belief is that it came from a Native American word for moccasin. Native Americans stuffed their moccasins with sagebrush to keep warm, making a larger footprint. There is also a Nampa in Canada.

Visitors to Nampa may notice a certain odor about the city, especially on foggy days. This is a by-product of the Amalgamated Sugar Factory, a sugar beet processing plant. When the beets are cooked, they emit an odor. Though it may be unpleasant at first, long-time residents grow to like the smell, and always think of it as home, similar to the smell of gingerbread for others.