Tris, or Tris(hydroxymethyl) aminomethane, is an organic compound used in biochemistry and molecular biology as a component of buffer solutions,

Tris or TRIS may also refer to:

Chemicals Tris(2-chloroethyl) phosphate, a flame retardant Tris(2,3-dibromopropyl) phosphate, a flame retardant TRIS (drug) (trisescaline, trescaline), a psychedelic-related compound

People Tris Speaker, a baseball player Tris Prior, a character in the Divergent book series and its film adaptations

Other uses TRIS online, a former bibliographic database created by U.S. Department of Transportation Research Information Services online TRIS, the ICAO type designator for the Britten-Norman Trislander