TMA may refer to:
Science
- Tense–Modality–Aspect or tense–aspect–mood, grammatical system
- Tetramethylammonium ion or its salts
- Thermomechanical analysis
- Third man argument, a philosophical criticism of Plato's theory of Forms
- Thrombotic microangiopathy
- Tissue microarray, device for analysing many histological tissue samples
- Transcription mediated amplification
- Trimethylamine, (CH3)3N, a simple amine
- Trimethylaluminium, (CH3)3Al
- Trimesic acid
- Psychedelic or hallucinogenic drugs that are isomeric-substituted amphetamines:
- Tristeza y muerte de agave, a collective term for diseases of blue agave
Transportation
Aviation
- Terminal Manoeuvring Area / Terminal Control Area - aviation term for a controlled high-volume airspace
- Trans Maldivian Airways
- TMA Cargo, Lebanese airline
Engineering
- TMA Engineering, UK
- Truck-mounted attenuator, crash attenuator
Space exploration
- Russian Soyuz spacecraft missions; TMA are the Russian initials for Transport Modified Anthropometric
- Soyuz TMA-1, launched 30 October 2002
- Soyuz TMA-2, launched 26 April 2003
- Soyuz TMA-3, launched 18 October 2003
- Soyuz TMA-4, launched 19 April 2004
- Soyuz TMA-5, launched 14 October 2004
- Soyuz TMA-6, launch 15 April 2005
- other Soyuz-TMA missions
Military
- Target Motion Analysis, by submarine SONAR
- Tanzania Military Academy
- Yugoslavian landmines:
Communications
- Television Market Area, official designation of the U.S. Federal Communications Commission
- Tower Mounted Amplifier or masthead amplifier
Medicine
- Tissue microarray, a paraffin block in which tissue cores are assembled in array fashion to allow multiplex histological analysis
Other
- Tehsil Municipal Administration
- Tejano Music Awards
- Texas A&M Maritime Academy, at Texas A&M University at Galveston
- Theatre Musicians Association, US
- TMA (The Marketing Arm), a marketing and creative agency owned by Omnicom Group
- TMA Awards of the UK Theatrical Management Association
- Total Media Agency, a Japanese pornographic video production company
- The Mod Archive, a web index and archive of playable music module files
- The Magnus Archives, a fictional horror podcast produced by Rusty Quill
- "The Magician's Apprentice", a 2015 episode of Doctor Who
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