Hanover is a town located along the Connecticut River in Grafton County, New Hampshire, United States.

Most of the population resides in the Hanover census-designated place (CDP)—the main village of the town.

Located at the junctions of New Hampshire routes 10, 10A, and 120, the Hanover CDP recorded a population of 9,078 people at the 2020 census.

Hanover was chartered by Governor Benning Wentworth on July 4, 1761, and in 1765–1766 its first European inhabitants arrived, the majority from Connecticut.

Dartmouth College was established in 1769 beside the town common at a village called "the Plain"—an extensive and level tract of land a mile (1.6 kilometers) from the Connecticut River, and about 150 feet (46 m) above it.

[4][5][6] At one point in its history, the southwest corner of Hanover, site of "The Plain", was known as "Dresden", which in the 1780s joined other disgruntled New Hampshire towns along the Connecticut River that briefly defected to what was then the independent Vermont Republic.

[9] "Hannover" (with a double n, as it was spelled in the 1761 charter and in its German original form as well) was named either after a local parish in Sprague, Connecticut, or after the German House of Hanover (which originated in 1635 as a cadet branch of the House of Brunswick-Lüneburg when George, Duke of Brunswick moved to the city of Hannover)[10]: 25  in honor of the reigning British-Hanoverian king, George III.

[11] Today, the original Hannover is the capital and largest city of Lower Saxony, the second-largest state in Germany.

The highest point in Hanover is the north peak of Moose Mountain, at 2,313 feet (705 m) above sea level.

[21] In the New Hampshire Senate, Hanover is included in the 5th District and is represented by Democrat Suzanne Prentiss.

On the New Hampshire Executive Council, Hanover is in the 1st District and is represented by Republican Joseph Kenney.