Kvitsøy is a municipality in Rogaland county, Norway. It is the smallest municipality in Norway (in area). Kvitsøy was separated from Mosterøy on 1 January 1923.

The municipality is an archipelago situated 2 nautical miles (3.7 km; 2.3 mi) northwest of the coast of the Stavanger peninsula. The largest island is connected with only a few of the other islands in the archipelago.

The Old Norse: form of the name was Hvítingsøy(jar) which means "the white island(s)", probably because there is white quartz in the rocks on the islands.

The coat-of-arms is from modern times. They were granted in 1989. The arms show three silver lighthouses on a field of blue.

Kvitsøy is first mentioned in the Snorre Saga, where Snorre records a truce being made between King Olaf II of Norway later to be known as St. Olav (Hellige Olav) and Erling Sjalgsson, under the stone cross. Later it seems that the islands was owned by the Church until the reformation in 1536 (from Roman Catholic to Lutheranism), when it became Crown property. In 1591 the population had become large enough to fund the raising of a church, which is still standing and the first new church in the county after the reformation. From the mid 18th century Kvitsøy was the location of one of the first navigation beacons in western Norway, and this was later converted to a lighthouse service. To this date^[update] it is the home of the region's naval navigation service.