- Tartu Observatory
- Technical University in Zvolen
- Technical University of Lisbon
- Technical University of Munich
- Technische Universität Dresden = Dresden University of Technology
- Technische Universität Munchen - Technical University Munich - Université Technique de Munich
- Technologie campus Gent - KU Leuven
- The Field Museum
- The Forest Research Institute
- The Morton Arboretum
- The Ohio State University [Columbus]
- The University of Western Australia
- Thuenen Institute of Climate-Smart Agriculture
- Thuenen Institute of Forest Ecosystems
- Thunen Institute of Climate-Smart Agriculture
- Thünen Institute of Climate-Smart Agriculture
- Thunen Institute of Forest Ecosystems
- Thünen Institute of Forest Genetics
- Thünen-Institut für Forstgenetik
- Transfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés
- Trinity College Dublin