RTT

RTT may be:

* Ramified Theory of Types, in mathematics, a type theory by Russel and Whitehead
* Real-time tactics, genre of strategy games
* Réduction du temps de travail, France's 35-hour workweek program
* Régie des Télegraphes et Téléphones, previous name of Belgacom, telecom company in Belgium
* "Remember the Titans (2000 film)," an American film featuring Denzel Washington
* 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
* Reynolds transport theorem, a fundamental theorem used in formulating the basic conservation laws of fluid dynamics
* Recapture Tactics Team, a Marine Corps unit or element within Marine Corps Security Forces