Tra or TRA may refer to:

Biology

* TRA (gene), in humans encodes the protein T-cell receptor alpha locus * Tra (gene), in ''Drosophila melanogaster'' encodes the protein female-specific protein transformer * Tra gene, a transfer gene * Triple releasing agent or serotonin-norepinephrine-dopamine releasing agent

Organizations

* Taiwan Railways Administration, the main railway system in Taiwan * Tanzania Revenue Authority * Telecommunications Regulatory Authority of Lebanon * Telecommunications Regulatory Authority (UAE) * Tennessee Regulatory Authority, for public utilities * Theodore Roosevelt Association * TRA, Inc., US ad measurement company * Trinity River Authority, Texas, US * Tripoli Rocketry Association, US

People

* Tra Hoa Bo Dê, King of Champa (in what is now southern Vietnam) 1342−1360 * Phạm Văn Trà (born 1935), Vietnamese general * Trần Văn Trà (1918–1996), North Vietnamese general * William Tra Thomas (born 1974), former US footballer

Other

* tRA (baseball statistic) * Taiwan Relations Act of the US, 1979 * Tarama Airport, IATA code * Theory of reasoned action, a model of persuasion * Threat and risk assessment * Tirahi language of Afghanistan, ISO 639-3 code * Constellation Triangulum Australe * Transport Research Arena, European conference * "Tra", a song by Bad Gyal from her 2018 album ''Worldwide Angel'' * "Tra", a song by Soto Asa featuring Bad Gyal {{disambiguation