Wapnö Castle, Manor house and castle in Halland, Sweden

Wapnö Castle is a manor house and castle in Halmstad Municipality in Halland. The estate includes the main building alongside extensive farmland and forest areas spread across the surrounding land.

Vapnö, formerly Wapnöghe, is recorded in 1312 as belonging to the Ribbing family. After the 1337 event later called the Wedding at Ulvåsa, Sigvid Ribbing and Märta Ulfsdotter settled here. The estate passed to Vadstena Abbey, then by exchange in 1409 to Abraham Brodersson, and in 1661 was bought by field marshal Gustaf Otto Stenbock. The oldest main building burned in 1733; the present corps-de-logi was built in the mid-18th century. Georg Bogislaus Staël von Holstein made Wapnö an entailed estate in 1754, dissolved in 1964; it became a listed building on 24 October 1983.

The estate sells its milk under the Wapnö name, and each spring it holds a betessläppning, a cattle release day when the cows are let out to pasture and many spectators gather. The farm also runs its own dairy, so visitors can follow the chain from cow to package.

The main building holds the restaurant and conference facilities, while the working farm around it is not a public park. The dairy sells its Wapnö products on site. Each spring the cows are released onto pasture at a betessläppning that draws onlookers, so time a visit around it if you want to see the herd let out.

Wapnö holds a permit for nearly 1,400 dairy cows, making its farm Sweden's largest milk producer. The milk is processed in the estate's own dairy and sold under the Wapnö name by the company Wapnö AB. Each spring the cows are released onto pasture at a betessläppning that draws many onlookers.