TEC or Tec may refer to:

• Trichy Engineering College, in Konalai, Tamil Nadu, India
• Costa Rica Institute of Technology
• Monterrey Institute of Technology and Higher Education, in Monterrey, Mexico
• Tertiary Education Commission (disambiguation)
• The East Carolinian, a campus newspaper of East Carolina University
• Texas Eastern Conference, an American junior college athletic conference

• Tasmanian Electoral Commission, Australia
• The Episcopal Church (United States)
• Telecommunication Engineering Center, an Indian government agency
• Tsunami Evaluation Coalition, a coalition created to evaluate the response to the 2004 Indian Ocean earthquake
• Transatlantic Economic Council, an agreement between the US and EU
• Training and enterprise council, a former type of UK training program administrator
• Topographic Engineering Center, former name of the US Army Geospatial Center
• Treaty establishing the European Community, a former name for the principal EU Treaty
• Transitional Executive Council, a government body that helped facilitate South Africa's transition to democracy in 1994

• TEC-3 or Technician third grade, United States Army rank
• TEC-4 or Technician fourth grade, United States Army rank
• TEC-5 or Technician fifth grade, United States Army rank
• I.G. Brown Air National Guard Training and Education Center, Knoxville, Tennessee

• Nechama Tec, Professor Emerita at the University of Connecticut
• Roland Tec, American writer and movie director

• TEC (gene), a human gene
• Thermoelectric cooling, a process to create a heat flux between two different materials
• Time error correction (TEC)
• Transient erythroblastopenia of childhood, a medical condition
• Threshold Exceeds Condition, a value used in computer hard disk evaluation
• Total electron content, a descriptive quantity of the Earth's ionosphere
• Triethylcholine, a drug
• TEC, a Russian abbreviation for thermal power stations in Russia and Soviet Union with combined heat and power plant

• Tech (river) (Catalan: Tec), Pyrénées-Orientales département, France
• TEC-9, a semi-automatic pistol
• Tec (album), a 2023 album by Lil Tecca
• SV TEC, a Dutch association football club
• Terik language (ISO 639-3 code: tec), spoken in Kenya
• Toshiba TEC Corporation, a subsidiary of Toshiba
• Tower en route control, a collection of air-traffic routes
• TRACE Expert City, an office complex in Sri Lanka
• Transport En Commun, a brand name of Belgian transport company Société Régionale Wallonne du Transport
• Turkish Engine Center
• Slang term for a detective