is a town and municipality in Vestfold county, Norway. The administrative centre of the municipality is the city of Larvik. The municipality of Larvik has about 41,364 inhabitants, and covers 530 km².
The city of Larvik was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The city of Stavern, and the rural municipalities of Brunlanes, Hedrum, and Tjølling were merged into the municipality of Larvik on January 1, 1988.
Larvik has a daily ferry connection to Hirtshals, Denmark.