Joroinen (Swedish: Jorois) is a municipality of Finland.
It is located in the Southern Savonia region. The municipality has a population of 4,984 (31 August 2017) and covers an area of 711.76 square kilometres (274.81 sq mi) of which 136.3 km2 (52.6 sq mi) is water. The population density is 8.66 inhabitants per square kilometre (22.4/sq mi).
Neighbouring municipalities are Juva, Leppävirta, Pieksämäki, Rantasalmi and Varkaus.
The municipality is unilingually Finnish.
Varkaus Airport is located in Joroinen.
Joroinen has the biggest frisbeegolf course in Finland with 36 fixed tracks.
Joroinen is often called Paris of the Savonia because in the 1700s the people of the manor spoke mainly French.
Historic manor houses of the area 
- Joroisniemi, Braseborg
- Paajala, Örnevik
Twin towns — sister cities
Joroinen is twinned with:
Media related to Joroinen at Wikimedia Commons