Ristiina was a municipality of Finland. It was founded in 1649 and it was named after Kristina Stenbock, the wife of Governor General and Count Per Brahe. From the beginning of the year 2013 is a part of Mikkeli city.

Ristiina is located in the province of Eastern Finland and is part of the Southern Savonia region. The municipality has a population of 4,856 (31 December 2012) and covers an area of 742.02 square kilometres (286.50 sq mi) of which 175.87 km (67.90 sq mi) is water. The population density is 8.5772/km (22.2149/sq mi).