Logan is a city in Cache County, Utah, in the United States. As of the 2000 census, the city population was 42,670, a substantial increase over the 1990 figure of 32,771. The estimated population in 2004 had increased to 45,517. The Logan metropolitan area contains 109,666 residents. It is the county seat of Cache County^GR6. Logan is located in northern Utah, north of Ogden on the Logan River; it is about 82 miles (130km) north of Salt Lake City. The city was founded in 1859 by Mormon settlers and has been the location of the Logan Utah Temple since its dedication in 1884. It is home to the main campus of Utah State University, founded in 1888, and is often known as a college town. It is also a major producer of cheese and other dairy products.

Logan is the principal city of the Logan, UT-ID Metropolitan Statistical Area, which includes Cache County in Utah and Franklin County in Idaho. In 2005, Morgan Quitno declared the Logan metropolitan area the safest in the United States.