Flag of Vestfold

Coat of arms of Vestfold

Svenner lighthouse on an island of the coast of Larvik

Vestfold is a former county in Norway. It bordered Buskerud and Telemark. The county administration was in the city of Tønsberg. Vestfold was west of the Oslo Fjord. The river Numedalslågen runs through the area. Many islands are at the coast. Vestfold is mostly lowland areas. It is among the best agricultural areas of Norway.

On 1 January 2020 the county merged with Telemark to the current county of Vestfold og Telemark.