TMI may refer to:

Look up TMI in Wiktionary, the free dictionary.

• TMI Associates, a Japanese law firm
• TMI Episcopal, formerly Texas Military Institute, a preparatory school affiliated with the Episcopal Church
• Taiwan Music Institute, a musical institute` in Taiwan
• Teen Missions International, an interdenominational mission organization based in Florida
• Three Mile Island Nuclear Generating Station, a nuclear power station in Pennsylvania, USA
• Time Module (TMI), a member of the Seiko Group, manufacturer of watch movements
• Toastmasters International, an international public speaking organization
• Tolani Maritime Institute, a Merchant Navy training institute
• The Monroe Institute, a nonprofit education and research organization
• Thomas More Institute, a secular academic institution located in Montreal, Quebec, Canada

• 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

• 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

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