| Acronym | Meaning |
| TEMO | Topological Effects On MO |
| TENR | Technologically Enhanced Natural Radioactivity |
| TEO | Topological Equivalent Orbital |
| TEOM | Tapered Element Oscillating Microbalance |
| TEOS | Tetraethyl Orthosilicate |
| TEP | Thermoelectric Power |
| TEQ | Toxicity Equivalent |
| TER | Total External Reflection |
| TERA | Toxicology Excellence For Risk Assessment |
| TERRA | Tandem Accelerator For Environmental Research And Radiocarbon Analysis |
| TERRACE | Terrestrial Runoff Modeling For Risk Assessment Of Chem. Exposure |
| TERT | Telomerase Reverse Transcriptase |
| TES | Transition-edge Sensor |
| TES | Tropospheric Emission Spectrometer |
| TESS | Transform Method For Extinction-scattering With Spatial Resoln. |
| TESS | Triboelectrostatic Separation |
| TESSA | Total Exhaust Solvent Scrubbing Apparatus |
| TETS | Totally Enclosed Treatment Systems |
| TEV | Tobacco Etch Virus |
| TEWI | Total Equivalent Warming Impact |
| TEY | Total Electron Yield |
| TF/SC | Trickling Filter/Solids Contact Process (for Wastewater Treatment) |
| TFA | Thin Film On ASIC |
| TFA | Thomas-Fermi-Amaldi (equation) |
| TFA | Target Factor Analysis |
| TFA | Total Fatty Acids |
| TFA | Trifluoroacetic Acid |
| TFB | Thin Film Balance |
| TFC | Thin Film Composite Membrane |
| TFC | Turbulent Flow Chromatography |
| TFDW | Thomas-Fermi-Dirac-Von Weizsaecker (method For Electronic Structure Calcns. On Mols.) |
| TFE | Thermionic Fuel Element |
| TFEL | Thin-film Electroluminescence |
| TFELD | Thin Film Electroluminescent Device |
| TFFF | Thermal Field Flow Fractionation |
| TFPI | Tissue Factor Pathway Inhibitor |
| TFR | Thin Film Resonator |
| TFR | Transferrin Receptor |
| TFRS | Transition Flow Reaction System |
| TFT | Thin Film Transistor |
| TFTR | Tokamak Fusion Test Reactor |
| TFW | Thomas-Fermi-Weizsaecker (electron-d. Theory) |
| TGA | Thermogravimetric Analysis |
| TGCE | Thermal Gradient Capillary Electrophoresis |
| TGDDM | Tetraglycidyl-4,4'-diaminodiphenyl Methane Epoxy |
| TGEP | Trace Gas Exchange Program |
| TGF | Transforming Growth Factor |
| TGGE | Temperature Gradient Gel Electrophoresis |
| TGIC | Temperature Gradient Interaction Chromatography [reversed Phase HPLC With Variable Column Temp. During Elution] |
| TGIC | Triglycidyl Isocyanurate |