TC
- Tc – (s) Technetium
- TC – (s) Teracoulomb – Turks and Caicos (ISO 3166 digram) – United Arab Emirates (FIPS 10-4 country code; from Trucial Coast States)
- TCA – (i) Transformational Communications Architecture – (s) Turks and Caicos (ISO 3166 trigram)
- TCAS – (i) Traffic Collision Avoidance System
- TCAA – (i) Top Counter-Assault Agents
- TCCCS – (i/a) Tactical Command, Control and Communication System ("ticks")
- TCD – (s) Chad (ISO 3166 trigram)
- TCG – (i) Trusted Computing Group – Türkiye Cumhuriyeti Gemisi
- TCHD – (i) Truck Cargo Heavy Duty
- TCL – (i) Tool Command Language
- TCM – (i) Turner Classic Movies
- TCP – (i) Traffic Control Point – Transmission Control Protocol – Trichlorophenol
- TCU – (i) Texas Christian University
- TCWMS – (i) Tele-Center Workforce Management System
- TCW – (i) Tasty Coma Wife
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