TR1

TR1 may refer to:


 * C++ Technical Report 1, a document proposing additions to the C++ Standard Library
 * Regency TR-1, an early transistor radio model
 * Triumph 20TS, an unsuccessful automobile prototype unofficially called the TR1
 * Tomb Raider (1996 video game), the first video game in the Tomb Raider series
 * TR-1A or TR-1B, variants of the Lockheed U-2 surveillance aircraft
 * Hitachi TR.1
 * TR.1, see Orenda Engines
 * TR1, a postal district in the TR postcode area
 * TAS1R1, a taste receptor
 * Tri-R KIS TR-1, an American aircraft design
 * Lyulka TR-1, first Soviet turbojet engine
 * Tropical Race 1, a strain of Fusarium oxysporum that causes the Panama disease
 * Type 1 regulatory T cell (Tr-1), a T-lymphocyte lineage with immunoregulatory function
 * Yamaha TR-1 High Output Boating Engine
 * VR Class Tr1, a Finnish locomotive class