| TQM | Total Quality Management |
| TQC | Total Quality Control |
| QM | Qualitätsmanagement, Quality Management |
| RQSM | Regional Quality Service Management |
| EFQM | European Foundation for Quality Management |
| IQMS | Integrated Quality Management System |
| CAQM | Computer Aided Quality Management [engl.] Methode zur Qualitätsverbesserung |
| t. | total |
| tot. | total |
| TIER | Total Indoor Environmental |
| TOC | Total Organic Carbon |
| TOX | Total Organic Halogen |
| TNV | Total Network Visibility |
| TVD | Total Virus Defense |
| TSD | Total System Design |
| TSA | Total Surface Area |
| TOC | Total Cost of Ownership |
| TOSS | Total Suppression of Sidebands |
| TPM | Total Productive Maintenance |
| TIA | Total Information Awareness |
| TAN | Total Area Network |
| TCO | Total Cost of Ownership Berechnungsverfahren in der Betriebswirtschaftslehre |
| T. L. O. | total loss only [engl.] Versicherung nur gegen Totalverlust |
| TACS | Total Access Communications |
| TBO | Total Benefits of Ownership |
| TCF | Total Cash Flow Ansatz Verfahren der Unternehmensbewertung |
| TRIX | Total Rate Imaging of X-rays |
| ATI | Average Total Inspection [engl.] Durchschnittliche Anzahl der geprüften Elemente in der Qualitätssicherung |
| TXRF | Total-reflection X-Ray Fluorescence analysis |
| ATR | Attenuated Total Reflection [engl.] |
| TVOC | Total Volatile Organic Compounds |
| Sci. Total Environ. | Science of the Total Environment [hat ein eigenes Review] Zeitschrift |
| TRAC | Total Risk Analysis Calculation [SunTrac] |
| TLO | total loss only [nur gegen Totalverlust versichert] |
| TRFA | Total reflexions Roentgen Fluoreszenz Analyse |
| CDTV | Commodore Dynamic Total Vision [engl.] Amiga mit CD-Laufwerk |
| SQ | Signal Quality |
| HQ | High Quality |
| CQ | Commercial Quality |
| LQ | Letter Quality |
| TLQ | Top Letter Quality |
| COQ | Cost Of Quality |
| QA | Quality Assurance |
| QW | Quality of Water Wasserqualität |
| NLQ | Near Letter Quality |
| QoS | Quality of Service |
| AQV | Air Quality V [engl.] Fünfte internationale Konferenz zur Luftverschmutzung in Arlington, Virginia |
| QFD | Quality Function Deployment |
| GQOS | Guaranteed Quality Of Service |
| IQL | Indifference Quality Level Indifferente Qualitätslage |