- Tashkent Institute of Irrigation and Melioration
- Technetics France
- Tectonics Observatory
- Texas Christian University
- The Bios Lab-on-a-chip Group
- The Institute for Geoscience Research [Curtin University]
- The Institute of Geoscience Research
- The Key Laboratory of Orogenic Belts and Crustal Evolution
- The Mineral Research and Exploration Institute
- Théoriser et modéliser pour aménager (UMR 6049)
- Thermochemistry Facility, Department of Chemical Engineering and Materials Science
- Thermo-Electron Corporation
- Thermohydraulics Department
- The Swiss Light Source (SLS)
- Tokushu Kosho Gijutsu Inc
- Tomakomai Research Station, Field Science Center for Northern Biosphere
- Tosca Environmental Services
- Total Compagnie Française des Pétroles
- Total, CST JF–TG|ISS
- Total E&P
- TOTAL S.A.
- TPAO
- Transducers Science and Technology group, MESA+ Institute for Nanotechnology
- Transgenèse et archivage d'animaux modèles
- Transport and Water Management Inspectorate
- Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés