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
This disambiguation page lists articles associated with the title HTT.
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