T66 may refer to:
- T66 (rocket launcher), an American multiple rocket launcher
- Avions Fairey T.66 Tipsy Nipper, a Belgian aerobatic aircraft
- Ericsson T66, a mobile phone
- Cooper T66, a racing car
- Hawker Hunter T.66, a British-built trainer aircraft
- INS Bitra (T66), a patrol vessel of the Indian Navy
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