| Acronym | Meaning |
| TBBA | Tightly-bound-on-the-bond Approxn. (band Structure Crystal) |
| TBBM | Tight-binding Bond Model |
| TBC | Thermal Barrier Coating |
| TBC | Toxicity Based Consent |
| TBC | Two-beam Coupling |
| TBEH | Tight-binding Extended Hueckel (extended Hueckel Tight-binding) |
| TBLMTO | Tight-binding Linear (combination Of) Muffin-tin Orbitals |
| TBM | Thyssen Blowing Metallurgy |
| TBM | Tight Binding Model |
| TBMD | Tight-binding Molecular Dynamics |
| TBN | Total Base Number |
| TBNEM | Tight-binding Nearly Free Electron Model |
| TBP | TATA-box Binding Protein |
| TBP | Tributyl Phosphate |
| TBPO | Terbutylperoctoate |
| TBSI | N-tert-butyl-2-benzothiazyl Sulfenimide |
| TBT | Tributyl Tin |
| TBTE | Tight-binding Total-energy (calcn. Method) |
| TBU | Tertiary Building Unit |
| TBW | Total Body Water |
| TBW | Total Body Weight |
| TC | Toxicity Characteristic |
| TC-GME | Time-convolution Generalize Master Equation (in Quantum Tunneling Calcns.) |
| TC-LIGS | Two-color Laser-induced Grating Spectroscopy |
| TC/MS | Thermal Chromatography/mass Spectrometry |
| TCA | Total Constituent Analysis |
| TCA | Traveling-cluster Approximation (a Generalization Of CPA For Electronic-structure Of Alloys) |
| TCA | Trichloroacetic Acid |
| TCA | Turbulent Contact Absorber |
| TCC | Thermofor Catalytic Cracking |
| TCC | Thermal Contact Cracking |
| TCCL | Toxic Chemicals Control Law (Korea) |
| TCD | Thermal Conductivity Detector (for Gas Chromatography) |
| TCDE | Two-center Dirac Equation |
| TCDFT | Two-component Density Functional Theory |
| TCDW | Target Continuum Distorted-wave (in At.-collision Calcns.) |
| TCDW1 | Target Continuum Distorted-wave 1st-order (for At. Collisions) |
| TCEQ | Texas Commission On Environmental Quality |
| TCF | T Cell Factor |
| TCF | Totally Chlorine-free [in Pulp Industry] |
| TCGF | T Cell Growth Factor |
| TCID50 | 50% Tissue Culture Infective Dose |
| TCJJP | Tech. Committee For Juice And Juice Products |
| TCL-GME | Time-convolutionless Generalized Master Equation (in Quantum Tunneling Calcns.) |
| TCLE | Thermal Coefficient Of Linear Expansion |
| TCLP | Toxicity Characteristic Leaching Procedure |
| TCM | Total Capacitance Method |
| TCM | Transport Control Measures |
| TCM | Tunneling Current Microscopy |
| TCO | Transparent Conducting Oxide |