TR2 may refer to:
- C++ Technical Report 2, a document proposing additions to the C++ Standard Library after Technical Report 1
- Tomb Raider II, a video game
- Theatre Royal 2, a drama productions studio, part of Theatre Royal, Plymouth
- Triumph TR2, a sports car from the British Triumph Motor Company
- a Tr2 2-10-0 steam locomotive (decapod) built in the USA, but operated in Finland
- TR-2, a variant of the Grumman American AA-1
- TR.2, a variant of the Hitachi TR.1
- TR.2, see Orenda Engines
- TR2, a postal district in the TR postcode area
- TAS1R2, a taste receptor
- Temple Run 2
- Westinghouse TR-2 research reactor operated in the 1960s
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