Tri- is a numerical prefix meaning three. Tri or TRI may also refer to:
Places Tri-Cities Regional Airport, Tennessee, US, IATA code TRI Triangulum constellation, astronomical abbreviation Tri Trinidad and Tobago, UNDP country code TRI
People Tri, Former nickname for wrestler Triple H Try Sutrisno, Vice President of Indonesia (1993–1998) Tri Rismaharini, Indonesian politician, Minister for Social Welfare (2020–) Tri Hartanto, Indonesian basketball player
Arts, entertainment, and media Tri (album), by Ana Stanić Tri (novel), a Slovenian novel El Tri, Mexican rock group Tri (film), a 1965 Yugoslav film directed by Aleksandar Petrović
Organizations Taipei Ricci Institute, an educational institute in Taiwan Tamalpais Research Institute, a virtual music venue, San Rafael, California, US Translational Research Institute (Australia) Transport Research Institute, in Scotland
Other uses AC Tripoli, a Lebanese association football club Total return index Toxics Release Inventory, US El Tri or El Tricolor, nicknames of the Mexico national football team Triangular function, tri(t) Trichloroethylene Triple reuptake inhibitors Trisakti University, an Indonesian campus based on Jakarta