Överkalix Municipality, Administrative municipality in Norrbotten County, Sweden.

Överkalix Municipality covers 2,919.47 km² in Norrbotten County, crossed north to south by the Kalix River, one of Sweden's few unregulated rivers. Its terrain combines moraine-covered hills with spruce and pine forest, long mires, and river sediments that support farmland. The Kalix's tributaries Ängesån and Tvärån–Lansån–Skrövån feed the river, and the municipality includes 14 exclaves within neighbouring municipalities.

The area took its current shape after territorial changes in 1870, when a section was separated to establish Korpilombolo. That territory eventually became incorporated into present-day Pajala Municipality.

The local Swedish dialect, överkalixmål, is not mutually intelligible with Standard Swedish. The municipality has a Finnish name, Ylikainuun kunta, reflecting the historical Finnish-speaking presence in the Torne Valley. The coat of arms, designed in 1944, is based on the parish arms and features an animal, though its exact meaning is unknown.

The E10 highway provides the main road connection to larger centers, with Luleå about 100 kilometers to the south serving as a key transportation hub. Getting around the region depends on having access to this primary route.

The municipality's coat of arms was designed in 1944 and based on the arms of the parish. Its exact meaning is not documented, though many northern Swedish arms feature bears, reindeer or other animals. The area also holds 14 exclaves inside the borders of neighbouring municipalities, counted in Statistics Sweden's 2012 survey.