Keflavík Airport (Icelandic: Keflavíkurflugvöllur [ˈcʰɛplaˌviːkʏrˌflʏɣˌvœtlʏr̥]) (IATA: KEF, ICAO: BIKF), also known as Reykjavík–Keflavík Airport, is the largest airport in Iceland and the country's main hub for international transportation. The airport is 1.7 nautical miles (3.1 kilometres) west of Keflavík and 50 km (30 mi) southwest of Reykjavík. The airport has three runways, two of which are in use, and the airport area is about 25 km2 (10 sq mi). Most international journeys to or from Iceland pass through this airport.

The main carrier at Keflavík is Icelandair, which has the airport as its main hub. The airport is only used for international flights; all domestic flights use the much smaller Reykjavík Airport, which lies three kilometres (two miles) from Reykjavík's city centre. Keflavík Airport is operated by Isavia, a government enterprise.