Tauber Manufacturing Institute, or TMI, is a graduate program collaboration between the Business and Engineering Schools at the University of Michigan, Ann Arbor

The Marshall Islands (rare usage)

Three Mile Island, a common term for a 1979 accident at the station

Transactions on Medical Imaging, a scientific journal covering medical imaging sciences and engineering

"TMI" ("too much information"), a slang expression indicating that someone has divulged too much personal information and made the listener uncomfortable.

TMI Conference on Theoretical and Methodological Issues in machine translation

Three Mile Island Nuclear Generating Station, a nuclear power station in Pennsylvania, U.S.

T.M.I.: The Episcopal School of Texas, formerly Texas Military Institute, a preparatory school affiliated with the Episcopal Church

"Too Much Information", a 1993 song by Duran Duran

Teen Missions International, an interdenominational mission organization based in Florida

Thinking Machines Inc. (TMI), a supercomputer manufacturer

The Monroe Institute, a nonprofit education and research organization devoted to the exploration of human consciousness

Transmarginal inhibition, a mental response to extreme stresses or pain

TMI Mudlib (TMI or TMI-2), an online game named after "The Mud Institute"

TMi (Too Much Information), a Saturday morning show on CBBC

"Too Much Information", a web comic by Obaki, started May 5 2005