Tribhuvan International Airport (Nepali: Tribhuvan International Airport, IATA: KTM, ICAO: VNKT) is an international airport in Kathmandu, Nepal. The airport is about six kilometres from the city centre, in the Kathmandu valley. It is the sole international airport in Nepal and has served as an airfield since 1949. The airport was inaugurated in 1955 by King Mahendra and received its current name in 1964. Originally a grass runway, it was re-laid in concrete in 1957 and has been extended several times. The first jet aircraft landed at Tribhuvan in 1967 and regular jet operations commenced in 1972.

The airport has one domestic and one international terminal. At present, about 30 international airlines connect Nepal to destinations in Asia and the Middle East, and the airport serves as a hub for several Nepalese airlines. In 2001, Royal Nepal Airlines discontinued their flights to Frankfurt and London, which severed Nepal's direct air links with Europe. Recently, Turkish Airlines launched direct flights from Istanbul to Kathmandu, re-establishing Nepal's connection with continental Europe. The Nepalese government has also recently announced that agreements have been made with Air New Zealand, Vietnam Airlines, and El Al to schedule direct flights to Kathmandu from Auckland, Hanoi, and Tel Aviv (Not limited to codeshare flights).