HTT may refer to: Hawthorn Tramways Trust, a defunct tram operator in Melbourne, Australia Higher Topos Theory, a treatise on higher category theory by American mathematician Jacob Lurie. Ho-kago Tea Time (English: After School Tea Time), the name of the school band from the manga and anime K-On! Huatugou Airport, in Qinghai, China Human Terrain Team of the United States Army The gene that encodes Huntingtin Hybrid turbocharger Hyper-threading Hyperloop Transportation Technologies, an American technology company