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

In 1971 the City of Ljungby (1936-1970) was amalgamated with the rural municipalities surrounding it, thus creating the present municipality. In 1974 a minor adjustment of the boundaries took place. There are 19 original entities within the area.

Ljungby Municipality contains a little more plains than average in Småland. Lakes, forests and plains are never far away. The tenth largest lake in Sweden, Bolmen, is located in the north-western part of the municipality. The town Ljungby is visited by thousands of tourists, mainly from Germany, every summer.

This is a demographic table based on Ljungby Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.^[3]

In total there were 28,396 inhabitants, including 21,191 Swedish citizens of voting age.^[3] 40.8% voted for the left coalition and 57.9% for the right coalition. Indicators are in percentage points except population totals and income.

Ljungby Municipality traces its history back to the Viking Age. Vikings followed the river Lagan and lived in its vicinity, and one of the locations were in what is now Ljungby Municipality.

In the 14th century several important medieval roads went through the municipality. In that century, an inn was established, and this was to form the center of Ljungby town.

During the 19th century the area closest to Ljungby itself consisted mostly of sand without any vegetation, and the government released funds to plant trees which would tie together the sand and make it suitable for plants.

The following cities are twinned with Ljungby:

• Ås, Akershus fylke, Norway
• Paimio, Southwest Finland, Finland
• Šilutė, Klaipėda County, Lithuania

• The opera singer Christina Nilsson was discovered while performing at the Ljungby market in 1857.
• Metallica bassist Cliff Burton died on a highway within the municipality when the band's tour bus overturned on 27 September 1986.