Ljungby Municipality is a municipality in Kronoberg County, southern Sweden, where the town Ljungby is seat.

Kronoberg County is a county or län in southern Sweden. Kronoberg is one of three counties in the province of Småland. It borders the counties of Skåne, Halland, Jönköping, Kalmar, and Blekinge. Its capital is the city of Växjö. While Kronoberg is an inland county, the southernmost fringes are about 20 kilometres (12 mi) from the coastline.