Heinola is a town and a municipality of 19,633 inhabitants (30 June 2015) located in the region of Päijänne Tavastia, Finland. Neighbour municipalities: Asikkala, Hartola, Iitti, Kouvola, Mäntyharju, Nastola, Pertunmaa and Sysmä.
Heinola is perhaps best known for its summer activities such as the Sauna-sitting World Championships, and for being the cradle of rheumasurgery.