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is a city in Marshall County, Alabama, United States and is included in the Huntsville-Decatur Combined Statistical Area. At the 2000 census, the population of the city was 7,395. The city is the county seat of Marshall County.
According to the U.S. Census Bureau, the city has a total area of 40.6 square miles (105.2 km²), of which, 23.6 square miles (61.3 km²) of it is land and 17.0 square miles (43.9 km²) of it (41.77%) is water.
Guntersville is located at the southernmost point of the Tennessee River on Lake Guntersville, formed by the Guntersville Dam. Geologically, the lake occupies a southern extension of Sequatchie Valley, which continues south as Browns Valley.