Pajala Municipality is a municipality in Norrbotten County in northern Sweden, bordering Finland. Its seat is located in the locality of Pajala.

Norrbotten County is the northernmost county or län of Sweden. It is also the largest county by land area, almost a quarter of Sweden's total area. It shares borders with Västerbotten County to the southwest, the Gulf of Bothnia to the southeast, the counties of Nordland and Troms in Norway to the northwest, and Lapland Province in Finland to the northeast.