Mariestad County (Swedish: Mariestads län) is a county in Sweden. It has an area of 10,246 sq km and a population of 256,236 residents. Capital of the county is Mariestad, although Skövde is the largest city.
Mariestad County is a constituency in the elections to the house of commoners.
Governor of Mariestad County is Henrik Landerholm af Strängnäs.