Saari (literally Island) is a former municipality of Finland. It was located in the province of Southern Finland and is part of the South Karelia region. The municipality had a population of 1,392 (2004) and covered an area of 183.08 km<sup>2</sup> of which 15.70 km<sup>2</sup> is water. The population density was 8.5673 inhabitants per km<sup>2</sup>.
The municipality was unilingually Finnish. Before the municipality was dissolved, Saari's neighboring municipalities were Kesälahti, Parikkala, Punkaharju, and Uukuniemi.
Saari was annexed to Parikkala and Uukuniemi municipalities on 1 January 2005. The new municipality was named Parikkala.