Mikkeli is a town and municipality in Finland. It is located in what used to be the province of Eastern Finland and is part of the Etelä-Savo region. The municipality has a population of 52,604 (31 December 2020) (around 34,000 in the town itself) and covers an area of 3,229.57 square kilometres (1,246.94 sq mi) of which 424.7 km² (164.0 sq mi) is water. The population density is 30.95 inhabitants per square kilometre (80.2/sq mi) The town is located on lake Saimaa.

Mikkeli was the site for the headquarters of the Finnish armed forces during World War II. In recognition of this, the town's coat of arms incorporates a pair of crossed Marshal Mannerheim's batons, and the town was awarded the Cross of Liberty, 4th class, to be displayed with the coat of arms.

A well-known and popular travel centre and theme park Visulahti is in Mikkeli, located in the shores of Lake Saimaa Mikkeli is a popular area for summerhouses due to its vast amount of lakes, in 2020 there were over 10 000 summer houses in Mikkeli, the second most in Finland increasing the population during the summer months. A Major part of tourism is based on nature and especially lakes.

Due to Mikkeli's role as the headquarter city in the World War II, the town has several museums dedicated to that period of time such as, the Infantry museum, the Lokki Communications Center, and the Headquarters museum.

The annual trotting event St Michel ravit is Mikkeli's largest event with approximately 20 000 spectators.

Hotels are concentrated in the center of Mikkeli. In other areas there are rental cottages scattered in the smaller villages and countryside.