Lillesand (Urban East Norwegian: [ˈlɪ̂lːəsɑn] ^ⓘ) is municipality in Agder county, Norway. It is part of the traditional district of Sørlandet. The administrative center of the municipality is the town of Lillesand. Some of the larger villages in Lillesand municipality include Åkerøyhamn, Brekkestø, Gamle Hellesund, Helldal, Høvåg, Ribe, Skottevik, Trøe, Ulvøysund, and Vesterhus.

The 190-square-kilometre (73 sq mi) municipality is the 306th largest by area out of the 356 municipalities in Norway. Lillesand is the 100th most populous municipality in Norway with a population of 11,419. The municipality's population density is 63.3 inhabitants per square kilometre (164/sq mi) and its population has increased by 13.8% over the previous 10-year period.

The town of Lillesand was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1962, the following areas were merged into a new, larger municipality of Lillesand:

The municipality was named after the town of Lillesand, originally just Sand (Old Norse: Sandr). The name is identical to the word sandr which means "sand" or "sandy beach". The prefix is lille, which means "little", was added after the founding of Christianssand in 1641 to distinguish it from the greater and more important town nearby.

The coat of arms was granted on 11 September 1987. The official blazon is "Azure, three anchors argent in pall annulets conjoined" (Norwegian: I blått tre sølv ankere forent i trepass). This means the arms have a blue field (background) and the charge is three anchors. The anchors have a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. The blue color in the field and the anchors were chosen to symbolize the connection that the municipality has with the sea. There are three anchors to symbolize the three smaller municipalities that were merged in 1964 to form the present municipality. The arms were designed by Daniel Rike. The municipal flag has the same design as the coat of arms.

The previous coat of arms for Lillesand was approved on 15 December 1954 and in use until 10 September 1987. The blazon was "Azure, an anchor under a tern volant argent". This means the arms have a blue field (background) and the charge is an anchor with an Arctic tern flying above it. The anchor and tern have a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. Both symbols refer to the long coastline of the municipality and the importance of fishing and shipping for the local economy. The arms were designed by Jens T. Thommasen and Kjell Westermark Mørch.

The Church of Norway has two parishes (sokn) within the municipality of Lillesand. It is part of the Vest-Nedenes prosti (deanery) in the Diocese of Agder og Telemark.

Sanden, which consisted of the small area near the harbor, was the original name for the municipality of Lillesand. Lillesand is built on the ancient estate of Lofthus. Christian Jensen Lofthuus was captured on his Lofthus estate around 1780.