Åsgårdstrand is a small port town in Horten Municipality in Vestfold county, Norway. The town is located along the shore of the Ytre Oslofjord, about 8 kilometres (5.0 mi) south of the town of Horten, about 10 kilometres (6.2 mi) to the north of the town of Tønsberg, and about 100 kilometres (62 mi) south of the capital city of Oslo. The villages of Borre and Skoppum both lie a short distance northwest of Åsgårdstrand.

Vestfold is a county and a current electoral district in Eastern Norway. Located on the western shore of the Oslofjord, it borders Buskerud and Telemark counties. The county administration is located in Tønsberg, Norway's oldest city, and the largest city is Sandefjord. With the exception of the city-county of Oslo, Vestfold is the smallest county in Norway by area. Vestfold was until 2019 the only county in which all municipalities had declared Bokmål to be their sole official written form of the Norwegian language.