TB
- Tb – (s) Terbium
- TB – (p) Tuberculosis
- TBA – (i) to be announced
- TBBPA – (p) TetraBromoBisPhenol-A
- TBC – (i) to be confirmed, to be continued
- TBD – (i) "to be documented", "to be determined", or "to be decided"
- TBD – (i) Torpedo Boat Destroyer
- TBF - to be fair
- TBGRI – (i) Tropical Botanic Garden and Research Institute, India
- TBH – (i) To Be Honest
- TBL – (i) Turkish Basketball League
- TBM – (i) Tactical Ballistic Missile – Theatre Ballistic Missile
- TBS – (i) Turner Broadcasting System
- TBT – (p) Tributyltin
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