Kalix (Kalix dialect: Kôlis, , ) is a locality and the seat of the Kalix Municipality in Norrbotten County, Sweden. The name Kalix is believed to originate from the Sami word Gáláseatnu, the ancient name of the Kalix River. It had 7,299 inhabitants in 2005, out of 17,300 inhabitants in the municipality of Kalix.