Kopervik is the largest town on the island of Karmøy in Rogaland county, Norway. It is also the administrative centre of the municipality of Karmøy. It is part of the traditional district of Haugaland. The town was also an independent municipality from 1866 until 1965.
The town has a population (2019) of 11,561 and a population density of . The municipality of Karmøy has about 42,000 inhabitants, so this means Kopervik is home to about 25% of the municipal population.
Kopervik is one of three towns in Karmøy (the others are Åkrehamn and Skudeneshavn). Kopervik is a transportation hub for scheduled boats going north to Bergen and south to Stavanger. The main industries are aluminium smelting and fishing. Kopervik contains Karmøy's municipal government buildings as well as a lot of the commercial development in the municipality. Kopervik Church has been located in the town for a long time. The previous church building was destroyed by fire in 2010, and its replacement was completed in 2016.
The village of Kopervik was declared a ladested (town) on 16 August 1866, and since towns could not be part of a rural municipality, it was separated from the municipality of Avaldsnes to form an urban municipality of its own. Initially, Kopervik had a population of 737 and it encompassed . On 1 January 1965, there were many big municipal mergers in Norway due to the work of the Schei Committee, and on that date the town of Kopervik was merged with the neighboring municipalities of Avaldsnes, Stangaland, Torvastad, Skudenes, and Åkra and with the nearby town of Skudeneshavn. Together these municipalities formed the new, large municipality of Karmøy. Prior to the merger, Kopervik had 1,737 residents. Kopervik lost its status as a "town" upon merging into Karmøy municipality. In 1996, due to some changes in the laws on towns, Karmøy municipality declared Kopervik to be a town once again.
According to legend, King Sverre I of Norway ordered the construction of a wooden castle on the headland at the entrance to the harbour where Kopervik is located today.