TMI may refer to:
Organizations Taiwan Music Institute, a musical institute in Taiwan Teen Missions International, an interdenominational mission organization based in Florida The Monroe Institute, a nonprofit education and research organization Three Mile Island Nuclear Generating Station, a nuclear power station in Pennsylvania, USA Thomas More Institute, a secular academic institution located in Montreal, Quebec, Canada Time Module (TMI), a member of the Seiko Group, manufacturer of watch movements TMI Associates, a Japanese law firm TMI Episcopal, formerly Texas Military Institute, a preparatory school affiliated with the Episcopal Church Toastmasters International, an international public speaking organization Tolani Maritime Institute, a Merchant Navy training institute
Science Trans-Mars injection, a propulsive maneuver used to set a spacecraft on a trajectory which will cause it to arrive to Mars Transmarginal inhibition, a mental response to extreme stresses or pain Trimethylindium, the most preferred metalorganic indium source for the MOCVD of Compound Semiconductors Tri-ponderal Mass Index, also known as corpulence index, an alternative to body mass index as an estimate of obesity
Other uses TMI, abbreviation for "Too much information", indicating information overload or excessively personal information "T.M.I." (South Park), a 2011 episode TMI Mudlib (TMI or TMI-2), online game software named for The Mud Institute The Mortal Instruments, a series of books by Cassandra Clare Sam & Mark's TMi Friday, previously called TMi, a Saturday morning show on CBBC Ton-mile or tmi, a unit of freight transportation quantity Tumlingtar Airport, an airport serving Tumlingtar, a city in Nepal "TMI" a song by Joan Jett and the Blackhearts from the 2013 album Unvarnished TMII LRT station, a light rail station in Jakarta, Indonesia