Lardal (Urban East Norwegian: [ˈlɑ̂rdɑːɫ]) is a former municipality in Vestfold county, Norway. The 278-square-kilometre (107 sq mi) municipality existed from 1838 until its dissolution in 2018. The area is now part of Larvik Municipality. The administrative centre was the village of Svarstad. The village of Steinsholt was also part of Lardal.

Pikstein, the highest point in Lardal, is located in western Lardal along the Buskerud county border.

The parish of Laurdal (later spelled Lardal) was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). The municipality included the three sub-parishes of Svarstad, Styrvoll, and Hem. On 1 January 1983, an unpopulated area of Bergan, just south of Steinsholt, was transferred to Lardal from the neighboring municipality of Hedrum. On 9 January 1987, another unpopulated area was transferred to Lardal from the neighboring municipality of Hedrum. On 1 January 2018, the municipality of Lardal was merged into the neighboring Larvik Municipality.

The municipality (originally the parish) is named after the Lardal valley (Old Norse: Lagardalr). The first element is the genitive case of lǫgr which means "water" or "river" (referring to the local river Numedalslågen). The last element is dalr which means "valley" or "dale". Prior to 1889, the name was spelled "Laurdal". In 1889, the spelling was changed to "Lardal".

The coat of arms was granted on 17 July 1992. The official blazon is "Gules, a hulder Or" (Norwegian: I rødt ei gull hulder). This means the arms have a red field (background) and the charge is a hulder. The hulder has a tincture of Or which means it is commonly colored yellow, but if it is made out of metal, then gold is used. The hulder is a part of old Scandinavian folklore. This was chosen to represent the large forested areas in Lardal that were said to be inhabited by hulder. The arms were designed by Arvid Steen. The municipal flag has the same design as the coat of arms.

The Church of Norway had three parishes (sokn) within the municipality of Lardal. It was part of the Larvik prosti (deanery) in the Diocese of Tunsberg.

Churches in Larvik

Parish (sokn)	Church name	Location of the church	Year built
Hem	Hem Church	Hem	c. 1100
Styrvoll	Styrvoll Church	Styrvoll	c. 1150
Svarstad	Svarstad Church	Svarstad	1657

• 
  Hem church
• 
  Styrvoll church
• 
  Svarstad church

Number of minorities (1st and 2nd generation) in Lardal by country of origin in 2017

Ancestry	Number
Poland	41
Lithuania	35
Bosnia	22

While it existed, this municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, unemployment, social services, zoning, economic development, and municipal roads. During its existence, this municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council. The municipality was under the jurisdiction of the Vestfold District Court and the Agder Court of Appeal.

The municipal council (Kommunestyre) of Lardal was made up of representatives that were elected to four year terms. The tables below show the historical composition of the council by political party.

The mayors (Norwegian: ordfører) of Lardal:

• List of former municipalities of Norway

• Media related to Lardal at Wikimedia Commons
• The dictionary definition of Lardal at Wiktionary
• Vestfold travel guide from Wikivoyage