Stockholm Arlanda Airport (IATA: ARN, ICAO: ESSA) is the main international airport serving Stockholm, the capital of Sweden. It is located in Sigtuna Municipality, 37 km (23 mi) north of Stockholm and nearly 40 km (25 mi) southeast of Uppsala. The airport is located within Stockholm County.

Arlanda is the largest airport in Sweden and the third-largest airport in the Nordic countries. The airport is the major gateway to international air travel for large parts of Sweden. Arlanda Airport was used by nearly 27 million passengers in 2017, with 21.2 million international passengers and 5.5 million domestic. The facility covers an expanse of about 2,500 hectares (9.7 sq mi) of airport property. Stockholm Arlanda serves as a major hub for Scandinavian Airlines and Norwegian Air Shuttle.

Stockholm Arlanda Airport is the larger of Stockholm's two airports. The other, Stockholm Bromma Airport, is located 7 km (4.3 mi) northwest of central Stockholm, but can be used only by smaller aircraft.