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