Ylitornio (Finnish: [ˈyliˌtornio]; Swedish: Övertorneå; Northern Sami: Badje-Duortnus; Inari Sami: Pajetuárnus) is a municipality of Finland. It is located in the province of Lapland along the Tornio River, opposite the Swedish town of Övertorneå about 7 kilometres (4.3 mi) by road to its northwest. The two localities are connected by an international bridge that goes between Övertorneå through an island and enters Finland in a rural portion of Ylitornio's municipality, about 5 kilometres (3.1 mi) north of town. Literally translated to English the two locations would be called Upper Tornio.

The municipality has a population of 3,673 (31 December 2025) and covers an area of 2,212.47 square kilometres (854.24 sq mi) of which 183.83 km² (70.98 sq mi) is water. The population density is 1.81 inhabitants per square kilometre (4.7/sq mi). The municipality is unilingually Finnish in contrast to much of far-western Finland. Finland is officially bilingual.

The motif of the coat of arms of Ylitornio Municipality refers to the Aavasaksa hill and the midnight sun. The coat of arms was designed by Jaakko Hänninen, and the Ylitornio Municipal Council approved it at its meeting on 28 September 1953. The Ministry of the Interior confirmed the coat of arms for use on 5 April 1954.

A unique ski flying hill project has been presented. The inruns of the hills will be through a mountain inside a pipe tunnel.[1]

Ylitornio has a subarctic climate (Köppen: Dfc) with long, harsh winters and short, mild summers.