TAM
TAM may refer to:

Biology
Thioacetamide, an organosulfur compound
Tumor-associated macrophage, a class of immune cells
Transparent Anatomical Manikin, an educational model

Technology
Tanque Argentino Mediano, the main battle tank of Argentina
Technological Association Malaysia, a learned society
Technology acceptance model, an information systems theory
Teen Age Message, interstellar radio transmissions
Telecom Application Map
Telephone answering machine
Twentieth Anniversary Macintosh, a limited-edition personal computer released by Apple in 1997

Transportation
TAM – Transporte Aéreo Militar, Bolivian airline
TAM Air, a Georgian airline
TAM Airlines, now known as LATAM Brasil
Tovarna avtomobilov Maribor, a former Slovenian commercial vehicle manufacturer,
Transports de l'Agglomération de Montpellier (TaM), a public transport company in France
IATA airport code of General Francisco Javier Mina International Airport, Tampico, Mexico
National Rail code of Tamworth railway station, England
TAM Management, Georgia
Tbilisi Aircraft Manufacturing, Georgia
MTR station code of Tamar station, Hong Kong
MRT station abbreviation of Tampines MRT station, Singapore

Characters
Tam Lin, in a Scottish Borders ballad
Tam Sventon, a private detective in Swedish children's novels
River Tam, in the Firefly television series
Simon Tam,  in the Firefly television series
Tấm, in the Vietnamese fairy tale The Story of Tam and Cam
Tam Song, in the Keeper of the Lost Cities series

Other uses
Tam (name), a list of people with the first name, nickname or last name
Tam cap
Tam o' shanter (cap), bonnet from Scotland
TAM (theatre), a theatre in North Rhine-Westphalia, Germany
TAM Media Research, an Indian television audience measurement company
TAM Mild Jalapeño, developed by Texas A&M University
Toyota Astra Motor, an Indonesian automotive company
Cyclone Tam (2006)
The Amaz!ng Meeting, conference on critical thinking
Total addressable market, for a product or service
Mount Tamalpais, California, known locally as Mount Tam
Tainan Art Museum, a museum in Tainan, Taiwan
Tamalpais High School, California, United States, often abbreviated as Tam
Picul or tam, a traditional Asian unit of weight
ISO 639-3 language code of the Tamil language
Team Action Management, programme that Albert S. Humphrey was involved with
Tense–aspect–mood (or Tense–aspect–mood–evidentiality, abbreviated as tame), refers to a group of grammatical categories in the study of linguistics.

See also
TAM 5 or The Spirit of Butts' Farm, the first model plane to cross the Atlantic Ocean
Tams (disambiguation)
Tamtam (disambiguation)