| TAPhA | Transactions and Proceedings of the American Philological Association | In English | → Serial publications, periodicals → Philology |
| TApPh | Topics in Applied Physics | In English | → Serial publications, periodicals → Physics |
| TAPPI | Technical Association of Pulp and Paper Industry | In English | → Associations → Paper and board industry |
| TAPS | Transactions of the American Philosophical Society | In English | → Serial publications, periodicals → Philosophy, psychology |
| TASA | The Australian Sociological Association | In English | → Associations → Sociology |
| TASPR | TEchnical and Schedule Performance Report | In English | → Quality management |
| TAVERNS | Test And Verification Environment for Remotely Networked Systems | In English | → Networks, communication |
| TBBM | Techniques of Biochemical and Biophysical Morphology | In English | → Serial publications, periodicals → Biochemistry, biophysics |
| TBD | Türkiye Bilişim Derneği | In Turkish | → Organizations and associations |
| TBV | Türkiye Bilişim Vakfı | In Turkish | → Foundations |
| TCAO | Traitement de Corpus Assisté par Ordinateur | In French | → Computer-based techniques → Language, linguistics, literature |
| TCM | Total Content Management | In English | → Document processing → Knowledge management |
| TCM | Technical Control Management | In English | → Management |
| TCO | Tjänstemännens Centralorganisation | In Swedish | → Organizations and associations → Labour, labour economics |
| TCP | Transmission Control Protocol | In English | → Internet |
| TCP/IP | Transmission Control Protocol/Internet Protocol | In English | → Internet |
| TCPh | Topics in Current Physics | In English | → Serial publications, periodicals → Physics |
| TCSC | Trainer Control and Simulation Computer | In English | → Hardware |
| TD | Tidskrift för Dokumentation | In Swedish | → Serial publications, periodicals → Libraries |
| TDAPR | Telecommunications and Data Acquisition Progress Report | In English | → Serial publications, periodicals → Data → Telecommunications |
| TDMS | Terminal Data Management System | In English | → Data |
| TDP | Tracking Data Processor | In English | → Hardware → Data |
| TDSP | Time-Dependent Signal Processor | In English | → Hardware |
| TE | Travail Étranger | In French | → Organizations and associations → Labour, labour economics → History |
| TEAM | Test Européen d'Aptitude au Management | In French | → Management → Education |
| TecN | Technical News | In English | → Serial publications, periodicals → Applied sciences, technology |
| TecRv | Technology Review | In English | → Serial publications, periodicals → Astronomy |
| Tecto | Tectonics | In English | → Serial publications, periodicals → Geophysics |
| Tectp | Tectonophysics | In English | → Serial publications, periodicals → Geophysics |
| TeCu | Technology and Culture | In English | → Serial publications, periodicals → Astronomy → Civilization, culture, progress |
| TEF | Tuluzaj Esperantistaj Fervojistoj | In Esperanto | → Organizations and associations → Transport and postal services |
| TEG | Technical Evaluation Group | In English | → Organizations and associations |
| TEGV | Türkiye Eğitim Gönüllüleri Vakfı | In Turkish | → Foundations |
| TEI | Text Encoding Initiative | In English | → Data |
| TEJA | Tutmonda Esperantista Ĵurnalista Asocio | In Esperanto | → Associations → Newspapers, journalism |
| TEJK | Tut-Eŭropa Junulara Konferenco | In Esperanto | → Organizations and associations |
| TEJO | Tutmonda Esperanto Junulara Organizo (www.tejo.org) | In Esperanto | → Organizations and associations |
| TekEL | Технiчна електродинамiка = TekEl | Tekhnicheskaia Elektrodinamika | In Russian |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TekEl | Tekhnicheskaia Elektrodinamika = TekEL (look above) |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TEL | Thèse en ligne | In French | → Libraries → Higher education, universities |
| TEL | Tutmonda Ekumena Ligo | In Esperanto | → Organizations and associations → Religion, theology |
| TelIn | Telematics Informatics | In English | → Serial publications, periodicals → Computer science → Telecommunications |
| TELL | Turkish English Living Lexicon | In English | → Dictionaries → Linguistics |
| TEMA | Türkiye Erozyonla Mücadele, Ağaçlandırma ve Doğal Varlıkları Koruma Vakfı (www.tema.org.tr) | In Turkish | → Foundations → Nature and society → Forestry |
| TePhL | Technical Physics Letters | In English | → Serial publications, periodicals → Applied sciences, technology |
| TER | Travail d'Études et de Recherche | In French | → Research policy → Education |
| TerCo | Osservatorio Astronomico di Collurania Teramo - Contributi | In Italian | → Serial publications, periodicals → Astronomy |
| TerMm | Osservatorio Astronomico di Collurania Teramo - Memorie ed Osservazioni | In Italian | → Serial publications, periodicals → Astronomy |
| TerNC | Osservatorio Astronomico di Collurania Teramo - Note e Comunicazioni | In Italian | → Serial publications, periodicals → Astronomy |
| TES | Transactions Électroniques Sécurisées | In French | → Networks, communication → Electronics → Telecommunications |
| TEVA | Tutmonda Esperantista Vegetarana Asocio | In Esperanto | → Associations → Nutrition |
| TGA | Techniques de Gestion Administrative | In French | → Management → Economics |
| ThAFM | Theoretical and Applied Fracture Mechanics | In English | → Serial publications, periodicals → Mechanical engineering |
| THAP | Thermal/Hydraulic Analyzer Digital Computer Program | In English | → Software |
| ThApC | Theoretical and Applied Climatology | In English | → Serial publications, periodicals → Meteorology, climatology |
| ThAst | Theoretical Astrophysics | In English | → Serial publications, periodicals → Astronomy |
| ThCFD | Theoretical and Computational Fluid Dynamics | In English | → Serial publications, periodicals |
| THCM | Total Human Centric Management | In English | → Management |
| THG | Technical Harmonisation Group | In English | → Standardization → Engineering, technology |
| ThLZ | Theologische Literaturzeitung | In German | → Serial publications, periodicals → Religion, theology → Literature |
| THT | The Hardball Times | In English | → Serial publications, periodicals → Sport, physical exercises |
| TI | Tecnoloxías da información = IT | Information Technology | In English = IT | Informationstechnik | In German = IT | Inligtingstegnologie | In Afrikaans = TI | Tecnologia da Informação | In Portuguese |
In Galician | → Computer science → Telecommunications |
| TI | Tecnologia da Informação = IT (look above) |
In Portuguese | → Computer science → Telecommunications |
| TIA | Terminologie et Intelligence Artificielle | In French | → Computer-based techniques → Linguistics |
| TIB | Technische Informationsbibliothek | In German | → Libraries → Applied sciences, technology |
| TIC | Technologies de l'Information et de la Communication = TIC | Tecnologías de la Información y la Comunicación | In Spanish = IKT | Informations- und Kommunikationstechnologie | In German = ICT | Information and Communications Technology | In English = IKT | Informations- og kommunikationsteknologi | In Danish = IKT | Inligtings- en kommunikasietegnologie | In Afrikaans = ICT | Informatie- en Communicatietechnologie | In Dutch = TMK | Teknologi Maklumat dan Komunikasi | In Malay |
In French | → Computer science → Telecommunications |
| TIC | Tecnologías de la Información y la Comunicación = IKT, ICT, TMK (look above) |
In Spanish | → Computer science → Telecommunications |
| TID | Telefónica Investigación y Desarrollo | In Spanish | → Networks, communication → Telecommunications |
| TIE | Transnationals Information Exchange | In English | → Organizations and associations → International relations |
| TIE | Toy Industries of Europe (www.tietoy.org) | In English | → Organizations and associations → Entertainment |
| TIFF | Tagged Image File Format | In English | → Computer science |
| TIL | Technology Insertion Laboratory | In English | → Research institutes |
| TIMC | Transactions of the Institute of Measurement and Control | In English | → Serial publications, periodicals → Applied sciences, technology |
| TISI | Technologies de l’Information appliquées aux Systèmes Industriels | In French | → Computer-based techniques → Engineering, technology |
| TISI | Thai Industrial Standards Institute | In English | → Standardization |
| TIUCS | Transactions of the International Union for Cooperation in Solar Research | In English | → Serial publications, periodicals → Astronomy |
| TIWG | Technical Interface Working Group | In English | → Human-computer interaction |
| TJAu | Telecommunication Journal of Australia | In English | → Serial publications, periodicals → Telecommunications |
| TK | Tehnilised Komiteed | In Estonian | → Organizations and associations → Engineering, technology |
| TKMS | Thurgauische Konferenz der Mittelschullehrkräfte | In German | → Organizations and associations → Education |
| TLCSC | Top-Level Computer Software Component | In English | → Software |
| TLD | Top Level Domain | In English | → Networks, communication → Telecommunications |
| TLHSQ | Transactions of the Literary and Historical Society of Quebec | In English | → Serial publications, periodicals → Literature → History |
| TLL | Thesaurus Linguae Latinae | In Latin | → Encyclopaedias, reference works → Linguistics |
| TLL | Temasek Life Sciences Laboratory | In English | → Research institutes → Biological sciences → Biotechnology → Medicine |
| TLO | Technology Licensing Organization | In English | → Organizations and associations → Engineering, technology |
| TLS | Transport Layer Security | In English | → Networks, communication |
| TM | Test Maintenance | In English | → Maintenance and logistics |
| TM | Time Management | In English | → Management |
| TMA | Tierce Maintenance Applicative | In French | → Software |
| TMF | Transporter Maintenance Facility | In English | → Maintenance and logistics |
| TMIS | Technical Management Information System | In English | → Knowledge management |
| TMK | Teknologi Maklumat dan Komunikasi = TIC, IKT, ICT (look above) |
In Malay | → Computer science → Telecommunications |
| TMOPR | Telecommunications and Mission Operations Progress Report | In English | → Serial publications, periodicals → Telecommunications |
| TMP | Theoretical and Mathematical Physics | In English | → Serial publications, periodicals → Mathematics → Physics |
| TMS | Task Management System | In English | → Management |
| TMS | Technical Management System | In English | → Management |
| TN | Terra Nuova | In Italian | → Organizations and associations |
| TNA | The National Archives | In English | → Libraries |
| TNI | Technické Normalizační Informace | In Czech | → Standardization |
| TNS | Transaction Network Services (www.tnsi.com) | In English | → Networks, communication → Telecommunications |
| TNS | The Naturist Society (www.naturistsociety.com) | In English | → Organizations and associations |
| TNS | Total Network Solutions (www.tns.co.uk) | In English | → Hardware → 6218 → Telecommunications |
| ToCat | Topics in Catalysis | In English | → Serial publications, periodicals → Chemistry |
| TOCR | Transym Optical Character Recognition | In English | → Writing systems → Document processing |
| TOCRoSS | Table of Contents by Really Simple Syndication | In English | → Libraries |
| TOK | Tarptautinis olimpinis komitetas (www.olympic.org) = CIO | Comité International Olympique | In French = IOC | International Olympic Committee | In English = МОК | Международен олимпийски комитет | In Bulgarian = MOO | Međunarodni olimpijski odbor | In Bosnian = COI | Comitè Olímpic Internacional | In Catalan = MOV | Mezinárodní olympijský výbor | In Czech = IOK | Internationales Olympisches Komitee | In German = ΔΟΕ | Διεθνής Ολυμπιακή Επιτροπή | In Greek = IOK | Internacia Olimpika Komitato | In Esperanto = COI | Comité Olímpico Internacional | In Spanish = ROK | Rahvusvaheline Olümpiakomitee | In Estonian = KOK | Kansainvälinen olympiakomitea | In Finnish = COI | Comité Olímpico Internacional | In Galician = MOO | Međunarodni olimpijski odbor | In Croatian = NOB | Nemzetközi Olimpiai Bizottság | In Hungarian = IOC | Internationaal Olympisch Comité | In Dutch = IOK | (Den) internasjonale olympiske komité | In Norwegian = MKOI | Międzynarodowy Komitet Olimpijski | In Polish = COI | Comité Olímpico Internacional | In Portuguese = МОК | Международный олимпийский комитет | In Russian = MOK | Međunarodni olimpijski komitet | In Serbo-Croatian = MOV | Medzinárodný olympijský výbor | In Slovak = MOK | Mednarodni olimpijski komite | In Slovenian = МОК | Међународни олимпијски комитет | In Serbian = IOK | Internationella Olympiska Kommitté | In Swedish = МОК | Міжнародний олімпійський комітет | In Ukrainian |
In Lithuanian | → Organizations and associations → Sport, physical exercises |
| TokAB | Tokyo Astronomical Bulletin | In English | → Serial publications, periodicals → Astronomy |
| TokRe | Tokyo Astronomical Observatory Reprints | In English | → Serial publications, periodicals → Astronomy |
| TOLE | Tutmonda Ortodoksa Ligo Esperantista | In Esperanto | → Organizations and associations → 271 |
| TOMar | Travaux de l'Observatoire de Marseille | In French | → Serial publications, periodicals → Astronomy |
| TOMS | Transactions on Mathematical Software | In English | → Serial publications, periodicals → Software → Mathematics |
| TOS | Type Of Service | In English | → Networks, communication |
| TÖTIAD | Türk(iye) Örüntü Tanıma ve İmge Anlama Derneği | In Turkish | → Organizations and associations → Graphical processing → Image processing |
| TOYal | Transactions of the Astronomical Observatory of Yale University | In English | → Serial publications, periodicals → Astronomy |
| TPAG | Theory and Practice of Applied Geophysics | In English | → Serial publications, periodicals → Geophysics |
| TPC | Telemetry Preprocessor Computer | In English | → Hardware |
| TPh | Tidjschrift voor Philosophie | In Dutch | → Serial publications, periodicals → Philosophy, psychology |
| TPhCh | Topics in Physical Chemistry | In English | → Serial publications, periodicals → Physical chemistry |
| TPhy | Techniques of Physics | In English | → Serial publications, periodicals → Physics |
| TPM | Transport in Porous Media | In English | → Serial publications, periodicals → Physics |
| TPMs | Technological Protection Measures | In English | → Software → Artistic property |
| TPO | Transcultural Psychosocial Organization | In English | → Organizations and associations → Psychology |
| TPO | Towarzystwo Przetwarzania Obrazów | In Polish | → Organizations and associations → Image processing |
| TQI | Total Quality Involvement | In English | → Quality management |
| TQM | Total Quality Management | In English | → Quality management |
| TQP | Total Quality Program | In English | → Quality management |
| TRAFO | Transdisziplinäres Forschen Geistes-, Sozial- und Kulturwissenschaften | In German | → Social sciences → Civilization, culture, progress |
| TraGe | Travaux Géophysiques | In French | → Serial publications, periodicals → Geophysics |
| TrAX | Transformation API for XML | In English | → Software → Data |
| TREND | Technical Requirements Engineering Network Data Base | In English | → Data |
| TreP | Osservatorio Privato Specola Ariel Treviso Italia - Pubblicazione | In Italian | → Serial publications, periodicals → Astronomy |
| TRET | Telecommunications and Radio Engineering Telecommunications | In English | → Serial publications, periodicals → Telecommunications |
| TrGRC | Geothermal Resources Council Transactions | In English | → Serial publications, periodicals → Earth sciences → Energy economics |
| TriP | Osservatorio Astronomico di Trieste - Pubblicazioni | In Italian | → Serial publications, periodicals → Astronomy |
| TRIS | Test and Reliability Information System | In English | → Quality management |
| TrITA | Trudy Instituta Teoreticheskoi Astronomii | In Russian | → Serial publications, periodicals → Astronomy |
| TRL | Transport Research Laboratory | In English | → Research institutes → Transport and postal services |
| TRL | Test Readiness List | In English | → Quality management |
| TRMS | Technical Requirements Management System | In English | → Quality management |
| TROLL | Troupe Redonnaise Orientée Logiciel Libre | In French | → Software → Operating systems |
| TROPICS | TRansformations et Outils Informatiques Pour le Calcul Scientifique | In French | → Computer science → Mathematics |
| TrOS | Transactions of the Optical Society | In English | → Serial publications, periodicals → Optics |
| TRS | Troubleshooting Record Sheet | In English | → Quality management |
| TRSD | Test Requirements (and) Specification Document | In English | → Quality management |
| TSCS | Test Support Computer System | In English | → Hardware |
| TSDMO | Tellus Series Dynamic Meteorology and Oceanography | In English | → Serial publications, periodicals → Meteorology, climatology → Marine research, oceanography |
| TSE | Türk Standardları Enstitüsü | In Turkish | → Organizations and associations → Standardization |
| TSE | Türk Standardlari Enstýtüsü | In Turkish | → Standardization |
| TSEG | Tijdschrift voor Sociale en Economische Geschiedenis | In Dutch | → Serial publications, periodicals → Sociology → Economics → History |
| TSI | Tuberous Sclerosis International | In English | → Organizations and associations → Neurology |
| TSIS | Traffic Software Integrated System | In English | → Software → Transport and postal services |
| TSIV | Tubereuze Sclerosis in Vlaanderen | In Dutch | → Organizations and associations → Neurology |
| TSOP | The Society for Organic Petrology (www.tsop.org) | In English | → Organizations and associations → Petrology |
| TSP | Trajectory Synthesis Program | In English | → Software → Spaceflight engineering, astronautics |
| TSP | Trajectory Shaping Program | In English | → Software → Spaceflight engineering, astronautics |
| TSP | Test Software Program | In English | → Software |
| TSS | Test Software Support | In English | → Software |
| TSSLW | Travaux de la Société des Sciences et des Lettres de Wroclaw | In French | → Serial publications, periodicals → Mathematics and natural sciences → Language, linguistics, literature |
| TSW | Test Software | In English | → Software |
| TT | TEJO-Tutmonde | In Esperanto | → Serial publications, periodicals |
| TT | Tiroler Tageszeitung | In German | → Newspapers, journalism |
| TTBS | Trinidad and Tobago Bureau of Standards | In English | → Organizations and associations → Standardization |
| TTBS | Timber Trades’ Benevolent Society | In English | → Organizations and associations → Timber and woodworking industry |
| TTBS | Thames Traditional Boat Society | In English | → Organizations and associations → 6295 |
| TTCN | Tree and Tabular Combined Notation | In English | → Programming languages → Networks, communication |
| TTI | Translation Technologies, Inc. (www.translationtech.com) | In English | → Computer-based techniques → Linguistics |
| TTP | Trends in Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| TTSP | Transport Theory and Statistical Physics | In English | → Serial publications, periodicals → Physics |
| TTT | Teatro Trupo de Tuluzo | In Esperanto | → Organizations and associations → Theatre |
| TTT | Tut-Tera Teksaĵo = WWW | World Wide Web | In English |
In Esperanto | → Internet |
| TU | Toimihenkilöunioni | In Finnish | → Organizations and associations → Labour, labour economics |
| TUAG | Telecommunication Users Advisory Group | In English | → Organizations and associations → Telecommunications |
| TUASB | Tokyo University Institute of Space and Aeronautical Science Bulletin | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| TUASR | Tokyo University Institute of Space and Aeronautical Science Report | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| TÜBİSAD | Türkiye Bilgi İşlem Hizmetleri Derneği (www.tubisad.org.tr) | In Turkish | → Associations → Computer science |
| TÜBİSAD | Türkiye Bilişim Sanayicileri ve İşadamları Derneği | In Turkish | → Organizations and associations |
| TUC | Trades Union Congress | In English | → Organizations and associations → Labour, labour economics |
| TUCAA | The Ultimate Computer Acronyms Archive | In English | → Dictionaries |
| TUFEJ | Tokyo University Faculty of Engineering Journal Series | In English | → Serial publications, periodicals → Engineering, technology |
| TUFER | Tokyo Denki University Faculty of Engineering Research Reports | In English | → Serial publications, periodicals → Engineering, technology |
| TUISR | Tokyo University Institute Industrial Science Report | In English | → Serial publications, periodicals → Mathematics and natural sciences → Applied sciences, technology |
| TÜSİAD | Türk Sanayicileri ve İşadamları Derneği | In Turkish | → Organizations and associations |
| TWU | Transportation Workers Union of America | In English | → Organizations and associations → Labour, labour economics → Transport and postal services |
| TZW | Technologiezentrum Wasser (www.tzw.de) | In German | → Research institutes → Environmental technology, water supply, waste management |
| U&E | Usability & Ergonomie | In English | → Human-computer interaction |
| UA | Urban Anthropology | In English | → Serial publications, periodicals → Sociology |
| UAJ | Ural-Altaische Jahrbücher | In German | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| UALE | Universala Artista Ligo de Esperantistoj | In Esperanto | → Organizations and associations → Arts |
| UAM | University Art Museum | In English | → Museums → Higher education, universities → Arts |
| UAM | Unité d'Appui Multimédia | In French | → Computer science → Document processing |
| UAM | User Authentification Module | In English | → Software |
| UAMS | University of Antwerp Management School | In English | → Higher education, universities → Management |
| UAPM | Uniunea Artiştilor Plastici din Republica Moldova | In Romanian | → Organizations and associations → Arts |
| UAR | Upper Austrian Research | In English | → Research policy → Engineering, technology |
| UAW | United Auto Workers | In English | → Organizations and associations → Labour, labour economics → Automobile manufacturing |
| UBE | Uluslararası Bilgisayar Enstitüsü | In Turkish | → Computer science → Higher education, universities |
| UBER | Undetected Bit Error Rate | In English | → Computer science |
| UBF | Union Bouddhiste de France | In French | → Organizations and associations → Buddhism |
| UC | Unsatisfactory Condition | In English | → Quality management |