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
• Tax Receivable Agreements, a type of legal contract
• 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
• Trans Rights Activist
• "Tra", a song by Bad Gyal from her 2018 album Worldwide Angel
• "Tra", a song by Soto Asa featuring Bad Gyal