- TAP - Thermodynamique Analyse et Procédés
- TEI of Athens
- THIDE Environnement
- TIOGA
- TNO Automotive
- TNO Built Environment and Geosciences
- TNO Science & Industry
- TOTAL
- TOTAL FINA ELF
- TOTAL PAU
- TOTAL Research & Technology
- TOTAL S.A.
- TOTAL SA
- Taiyuan University of Technology
- Talbridge Corporation
- Tarbiat Modares University [Tehran]
- Tardec
- Tardec US Army
- Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
- Tech-Advantage
- Technical University of Berlin | Technische Universität Berlin
- Technion - Israel Institute of Technology [Haifa]
- Technip
- Technip-Flexifrance
- Technische Universität Darmstadt - Technical University of Darmstadt
- Technische Universität Dresden = Dresden University of Technology
- Technishe Universität Bergakademie Freiberg
- Technocentre Renault [Guyancourt]
- Technological Education Institute of Crete
- Tecnical University of Iasi
- Texas A&M University System
- Texas A&M University [College Station]
- Texas A&M University at Qatar
- TexasTech University
- The Department of Research of Energy Complex of Russia and the World, The Energy Research Institute of the Russian Academy of Sciences
- The Dow Chemical Company
- The French Institute for International and Strategic Affairs, (IRIS)
- The National IOR Centre of Norway
- The National IOR Centre of Norway, University of Stavanger
- The Netherlands Organisation for Applied Scientific Research
- The Open University of Japan [Chiba]
- The Pipeline Transport Institute (PTI, LLC)
- The Raghavan Group
- The Research Institute of Petroleum Exploration and Development
- The Scripps Research Institute [La Jolla, San Diego]
- The University of New Mexico [Albuquerque]
- The University of Tokyo
- The University of Western Australia
- The University of the West Indies
- Thermodynamique et Energétique des fluides complexes
- Three Cliffs Geomechanical Analysis Ltd
- ThyssenKrupp Uhde
- Tianjin University of Science and Technology
- Tim, Events and Architectures
- Tioga Research
- Total E&P
- Total Exploration Production
- Total M&S [Paris La Defense]
- TotalFina Raffinage & Marketing
- TotalFinaElf
- Tpa
- Transferts, écoulements, fluides, énergétique
- Transformation Intégrée de la Matière Renouvelable
- Transition Technologies S.A.
- Tsinghua University [Beijing]
- Tullow oil Ltd, Dublin, Ireland
- Twente University of Technology