TMA

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:
 * 3,4,5-trimethoxyamphetamine (TMA)
 * 2,4,5-trimethoxyamphetamine (TMA-2)
 * 2,3,4-trimethoxyamphetamine (TMA-3)
 * 2,3,5-trimethoxyamphetamine (TMA-4)
 * 2,3,6-trimethoxyamphetamine (TMA-5)
 * 2,4,6-trimethoxyamphetamine (TMA-6)
 * Tristeza y muerte de agave, a collective term for diseases of blue agave

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:
 * TMA-1 mine
 * TMA-2 mine
 * TMA-3 mine
 * TMA-4 mine

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