Simo is a Finnish municipality located in the southwestern part of the province of Lapland on the border of the province of Northern Ostrobothnia on the coast of the Gulf of Bothnia, along four roads. The municipality has a population of 2,979 and covers an area of ​​2,086.28 km², of which 618.96 km² is marine and 19.98 km² is inland waterways. The population density is 2.06 inhabitants / km². The Simojoki River flows through Simon. Simoa The nearest cities are Kemi, Tornio, Haparanda and Oulu. The neighboring municipalities are Ii, Kemi, Keminmaa, Ranua and Tervola. Simo is also known for its significant landscape areas in Simojoki.

Although the municipality belongs to the Kemi – Tornio region, it has exceptionally joined the Oulunkaari region in terms of social and health care.

Simo consists of many small village communities. Simon's attractions include the later Empire-style Simon's Church, completed in 1846, and a glacier cabin with a statue reminiscent of the Jaegers' Stage Route and the 1916 Simon Battle.

In 2015, the City of Kemi and the municipalities of Keminmaa and Simon negotiated the merger into a new city of Kemi. The merger was scheduled to take place from the beginning of 2017. The Kemi and Simon municipal councils approved the merger proposal, but the Keminmaa council rejected it.