Harrison is a census-designated place (CDP) in Hamilton County, Tennessee, United States.

Harrison Bay State Park, the Hamilton County Landfill, Bear Trace Golf Course, a course designed by Jack Nicklaus, and Skull Island, a recreational area owned by TVA, are all located in Harrison.

The county seat was later moved to Chattanooga, Tennessee, after the Civil War.

Some parts of the old city, such as old building foundations, roads, and guard rails, can still be seen, especially in and around Harrison Bay, named for the submerged town.

As of the 2020 United States census, there were 7,902 people, 3,132 households, and 2,321 families residing in the CDP.

16.6% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older.

Other recreation located nearby are: Skull Island (Birchwood), Booker T. Washington State Park (Bartlebaugh) and an assortment of Civil War Parks and other tourist attractions in and around Chattanooga.