Tris may refer to:
Chemicals
- Tris(hydroxymethyl) aminomethane, a biochemical buffer
 - Tris(2-chloroethyl) phosphate, a flame retardant
 - Tris(2,3-dibromopropyl) phosphate, a flame retardant
 
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
 
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