Vänersborg County (Swedish: Vänersborgs län) is a county in Sweden. It has an area of 13,084 sq km and a population of 453,248 residents. Capital of the county is Vänersborg, although Borås is the largest city.
Vänersborg County is a constituency in the elections to the house of commoners.
Governor of Vänersborg County is Göran af Skytte.