RTT

RTT may be:


 * Ramified Theory of Types, in mathematics, a type theory by Russel and Whitehead
 * Real-time tactics, genre of strategy games
 * Régie des Télegraphes et Téléphones, previous name of Belgacom, telecom company in Belgium
 * Render to Texture, in computer graphics, a method of achieving renderings in a scene.
 * Rett syndrome, a neurological disorder
 * Reverse Turing test, a Turing test where the roles of humans and computers are swapped
 * Round-trip delay time, in telecommunications

RTT