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is a city in Strafford County, New Hampshire, in the United States of America. The population was 26,884 at the 2000 census. It is the county seat of Strafford County, and home to the Woodman Institute Museum and the Children's Museum of New Hampshire.
According to the United States Census Bureau, the city has a total area of , of which is land and is water, comprising 8.06% of the city. Dover is drained by the Cochecho and Bellamy rivers. Long Hill, elevation above sea level and located northwest of the city center, is the highest point in Dover. Garrison Hill, elevation , is a prominent hill rising directly above the center city, with a park and lookout tower on top. Dover lies fully within the Piscataqua River (Coastal) watershed.
The city is crossed by New Hampshire Route 4, New Hampshire Route 9, New Hampshire Route 16, New Hampshire Route 16B, and New Hampshire Route 108. It borders the towns of Madbury to the west, Barrington to the northwest, Rochester to the north, Somersworth to the northeast, and Rollinsford to the east.