Tris or TRIS may refer to:

• Tris(hydroxymethyl) aminomethane, a biochemical buffer
• Tris(2-chloroethyl) phosphate, a flame retardant
• Tris(2,3-dibromopropyl) phosphate, a flame retardant

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

• 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

This disambiguation page lists articles associated with the title Tris.
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