The Tengah Air Base (IATA: TGA, ICAO: WSAT) is a military airbase of the Republic of Singapore Air Force (RSAF) located in the Western Water Catchment, in the western part of Singapore.

The air base is the most important airfield of the RSAF as it houses the majority of the RSAF's fixed-wing frontline squadrons, home to all of RSAF's Airborne early warning and control (AEWC) assets, most of the F-16C/D Fighting Falcons and many UAVs.

The airfield goes by the motto of Always Vigilant, which is supported by its main motif, a black knight chess piece symbolising the aircraft's operational readiness in Tengah. The sword represents war's heraldic sword of destruction, while the state is depicted by the castle.

Prior to Singapore's independence, it was a flying Royal Air Force station known as RAF Tengah.