The term T9 may refer to:
- T9 (predictive text), a predictive text input technology for mobile phones
- LSWR T9 class, a British locomotive class
- Sony Cyber-shot DSC-T9, a digital camera
- Tech N9ne, a hip hop artist from Kansas City
- Yepp, the Samsung YP-T9 MP3 player
- the IATA code for TransMeridian Airlines
- the ninth of the Thoracic vertebrae
- the ninth of the Thoracic nerves
- T-9, a Ford manual Transmission also known as Type 9
- M4 cannon, the 37 mm Automatic Gun, known as the T9 during development
- M22 Locust, an airborne light tank, known as the T9 during development
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