Air Force Base Waterkloof {AFB Wklf} is an airbase of the South African Air Force. It is situated on the outskirts of Pretoria, and is the SAAF's busiest airbase. The base's name means "water ravine" in Afrikaans and in Dutch. Despite the name, this base is not located in the suburban town of Waterkloof, Pretoria, but lies to the south of Pretoria, 4.34 nmi (8.04 km) to the northeast of Centurion, Gauteng and 3.37 nmi (6.24 km) from AFB Swartkop, at an elevation of 1506 metres (4940 ft).

The base motto is Acquirit Qui Tuetur (He Obtains Who Defends).