Lappeenranta (Swedish: Villmanstrand) is a city in Finland and the regional center of South Karelia, located on the southern shore of Lake Saimaa in the province of South Karelia. The city is located in the area between the southern shore of the Saimaa watershed and the Russian border. Lappeenranta is the 13th largest city in Finland in terms of population, with 72,266 inhabitants.

Lappeenranta's neighboring municipalities on the Finnish side are Imatra, Lemi, Luumäki, Miehikkälä, Ruokolahti and Taipalsaari. On the Russian side, the neighbors are Tienhaara (Seleznjovo), Enso (Svetogorsk) and Antrea (Kamennogorsk).

Until 1945, Lappeenranta belonged to Vyborg County. In 1945–1997 it belonged to Kymen county and in 1998–2009 to the province of Southern Finland. On 1 January 2020, the area of ​​Lappeenranta was 1,723.56 km², of which 1,433.78 km² is land and the remaining 289.78 km² is inland water areas.

In 2009, Lappeenranta was rated the fourth best image in the comparison of Finland's large cities. In the 2008 survey, Lappeenranta was ranked fifth. In a survey of business representatives conducted in 2011, Lappeenranta ranked 17th out of a total of 34 Finnish cities.

Lappeenranta gained worldwide visibility when the rights of the crime series Sorjonen, located in the city, were sold to 40 countries. The series was filmed in Lappeenranta in 2015–2019.