Taipalsaari is a municipality of Finland, located in the province of Southern Finland and part of the South Karelia region. It has a population of 4,574 and covers an area of 761.94 square kilometres, of which 416.88 square kilometres is water. The population density is 13.27 inhabitants per square kilometre. Neighbouring municipalities are Lappeenranta, Lemi, Puumala, Ruokolahti and Savitaipale, and the municipality is unilingually Finnish.
Taipalsaari is one of the municipalities covered by the Saimaa Geopark, a UNESCO Geopark established on 22 April 2021 and Finland's third geopark. The geopark covers the Saimaa Lake area, Finland's largest lake at 4,400 square kilometres, which is noted for the endangered Saimaa ringed seal.
South Karelia, the region to which Taipalsaari belongs, is the southeasternmost of Finland's 19 administrative regions. Its landscape is characterised by pine and spruce forests, low hills reaching up to about 200 metres, farmland with 18th- and 19th-century wooden houses, and numerous lakes. The regional capital is Lappeenranta, about 230 kilometres from Helsinki.