Seabrook is a town in Rockingham County, New Hampshire, United States.

[2] Located at the southern end of the coast of New Hampshire, on the border with Massachusetts, Seabrook is noted as the location of the Seabrook Station Nuclear Power Plant, the third-most recently constructed nuclear power plant in the United States.

[1] The census-designated place of Seabrook Beach occupies the eastern end of the town, along the Atlantic Ocean.

The highest point in Seabrook is 217 feet (66 m) above sea level on Grape Hill, whose 230-foot (70 m) summit lies just south of the town line in Salisbury, Massachusetts.

This creates a demand for fireworks in border towns like Seabrook, to the point where Massachusetts State Police have entered New Hampshire in efforts to crack down on transport of fireworks back over the border.