HTT

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