Loviisa (Finnish pronunciation: [ˈloviːsa]; Swedish: Lovisa) is a municipality and town of 15,597 inhabitants (31 January 2011) on the southern coast of Finland. About 43 per cent of the population is Swedish-speaking. The municipality covers an area of 1,751.49 square kilometres (676.25 sq mi) of which 931.92 km2 (359.82 sq mi) is water. The population density is 19.03 inhabitants per square kilometre (49.3 /sq mi).
The neighboring municipalities of Liljendal, Pernå and Ruotsinpyhtää were consolidated with Loviisa on January 1, 2010. Loviisa was founded in 1745, as a border fortress against Russia. Most of the fortifications have been preserved. It is named after Lovisa Ulrika, the Swedish Queen consort of Adolf Frederick of Sweden.