Kalix Municipality (Swedish: Kalix kommun, Finnish: Kainuun kunta) is a municipality in Norrbotten County in northern Sweden. Its seat is located in Kalix.

In 1924 Töre Municipality was detached from Nederkalix Municipality, forming a municipality of its own. In 1967 the two units were reunified, and the present municipality was created.

In historical times, Kalix was the name of the court district (Swedish: domsaga) Kalix Lower Court District. It covered two parishes: Lower and Upper Kalix (Swedish: Nederkalix and Överkalix, respectively). The chalice on the coat of arms was present in the Nederkalix coat of arms in 1800, and was incorporated into that of Kalix Municipality in 1989. The choice of symbol originates from the similarity between the Latin root of chalice, calix, mug (itself borrowed from Greek kalyx, κάλυξ, shell, husk) and the local Sami pronunciation of Gáláseatnu, an ancient name for the Kalix River.

There are twelve localities (or urban areas) in Kalix Municipality:

The municipal seat in bold

The extent of the Kalix Municipality is based on the traditional extent of the Kalix dialect, although slight (sub-)dialectal differences can be found from Sangis in the east, Töre in the west and Övermorjärv in the north. Today it is spoken along with Sami, Finnish, Meänkieli, Upper Kalix dialect, and the national standard language Swedish, which has replaced the Kalix as dialect as the common language in everyday life. Like other North Germanic languages the Kalix dialect originates from Old Norse and Proto-Norse, spoken by immigrating Germanic settlers during the Viking Age.

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