Tra or TRA may refer to:

• Iridescent shark, a type of shark catfish commonly sold as tra or swai
• Tra Hoa Bo Dê, King of Champa (in what is now southern Vietnam) from 1342 to 1360
• Phạm Văn Trà (born 1935), four-star general, former Chief of the General Staff of the Vietnamese Army and former Minister of Defense of Vietnam
• Trần Văn Trà (1918–1996), North Vietnamese lieutenant general and Vietcong leader
• William Tra Thomas (born 1974), former National Football League player

T-cell receptor alpha chain C region is a protein that in humans is encoded by the TRA@ gene.

Triangulum Australe is a small constellation in the far Southern Celestial Hemisphere. Its name is Latin for "the southern triangle", which distinguishes it from Triangulum in the northern sky and is derived from the almost equilateral pattern of its three brightest stars. It was first depicted on a celestial globe as Triangulus Antarcticus by Petrus Plancius in 1589, and later with more accuracy and its current name by Johann Bayer in his 1603 Uranometria. The French explorer and astronomer Nicolas Louis de Lacaille charted and gave the brighter stars their Bayer designations in 1756.