TM

TM or Tm and variants may refer to:
 * Trademark, often indicated with the symbol ™
 * Trademark symbol

Businesses and organizations

 * TM Forum, telecommunications and entertainment industry association
 * TM Supermarket, a chain of supermarkets in Zimbabwe
 * LAM Mozambique Airlines (IATA airline designator TM)
 * Telekom Malaysia, telecommunications company
 * Texas Mexican Railway (reporting mark TM)
 * TM (cellular service), a telecommunications brand in the Philippines
 * Toastmasters International, an international public speaking organization
 * Toyota Motor Corporation (NYSE symbol TM)
 * Tokyo Metro, one of the major subway systems of Tokyo

Biology and medicine

 * Melting temperature (Tm) in nucleic acid thermodynamics, at which half of DNA strands are in the ssDNA state
 * Transport maximum, where concentration increase does not speed membrane traversal
 * Transverse myelitis, a neurological condition in which the spinal cord is inflamed
 * Translational medicine

Computing

 * .tm, the Internet domain code for Turkmenistan
 * Struct tm, calendar time type in the C and C++ programming languages
 * Traceability matrix, in software development
 * Translation memory
 * Turing machine, a hypothetical universal computing machine

Physics and chemistry

 * Tm ligands, a tridentate ligand used in coordination chemistry
 * Melting point (abbreviated Tm), in physics and materials science
 * Thulium, symbol Tm, a chemical element
 * Transition metal
 * Transverse Magnetic modes, in optics and wave theory

Weapons

 * TM 65 mine, a Finnish anti-tank mine
 * TM series of Soviet and Russian anti-tank mines
 * TM-41 mine, a Soviet World War II mine
 * TM-46 mine, a Soviet post-war mine
 * TM-57 mine, a Soviet Cold War mine
 * TM-62 series of mines, a series of Soviet Cold War blast mines
 * TM-83 mine, a 1990s Russian mine
 * TM-89 mine, a 1990s Russian mine

Other uses in science and technology

 * Thematic Mapper, an Earth-observing sensor on a Landsat satellite
 * Terametre (Tm), equal to 1012 metres
 * TM (triode) (from French Telegraphie Militaire), standard small-signal vacuum tube of the Allies of World War I

People

 * Theresa May is sometimes referred to as TM

Other uses

 * Taskmaster (TV series), a British TV comedy show adapted in several other countries.
 * Thames Measurement, a shipping tonnage measure
 * Their Majesties, for multiple monarchs each styled "His/Her Majesty"
 * Torpedoman's mate, a former rank of the U.S. Navy
 * Transcendental Meditation, a specific form of mantra meditation
 * Trans-Manhattan Expressway, a highway in New York City
 * Turkmenistan (ISO country code TM)
 * TrackMania, a Nadeo game
 * TM (album), an album by Brockhampton