Loviisa is a municipality and town of 15,556 inhabitants (30 September 2012) 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 kilometers (676.25 sq mi) of which 931.92 km2 (359.82 sq mi) is water. The population density is 18.98 inhabitants per square kilometer (49.2 /sq mi).
The neighboring municipalities of Liljendal, Pernå and Ruotsinpyhtää were consolidated with Loviisa on January 1, 2010