TR3

TR 3 or TR3 or TR-3 may refer to:

Aeronautics

 * TR-3 Black Manta, a speculated spyplane and black program by the USAF
 * Lyulka TR-3, a 1940s Soviet jet engine
 * TR.3, a 1940s Canadian jet engine design study

Other uses

 * Tomb Raider III, the third game in the Tomb Raider series
 * TR3 (band), the Tim Reynolds Trio
 * Triumph TR3, a car from the United Kingdom
 * TR3, a postal district in the United Kingdom's TR postcode area
 * .tr3, a file extension format for the TomeRaider ebook reader
 * Tier 3 (nightclub)
 * TR3 Racing, an American auto racing team