Oskarström is the second largest locality in Halmstad Municipality, Halland County, Sweden, with 4,157 inhabitants in 2020.

As evidence of this, there are village grave fields with Iron Age dolmen, a stone circle and a trident.

The villages Mared and Espered were probably founded in the early Middle Ages and were approximately equal until the mid-1880s.

During the Nordic Seven Years' War (1563-1570) the Swedes, led by commander Charles de Mornay, fought against the forces of Danish King Frederick II at the Battle of Mared, where the present Oskarström is now located.

On January 27, 1905, Oskarström Municipal Society was founded on both sides of the border, between the parishes of Enslöv and Slättåkra.