Category - T
- 61 Cygni V (Tellar Prime)
- FRPG Timeline - the History of the Future
- Tal Shiar, The
- Targ
- Tellarite Mining Consortium, The
- Tellarites
- Temporal Mechanics (Time Travel)
- Thal (individual), The
- Thal (species), The
- Thal Covens
- Thal Hive Mind, The
- Thaleron
- Tholian Assembly, The
- Tholians
- Thytos, Kassandra
- Towers, Alexander
- Trans-Dimensional Co-ordinate System
- Transporter
- Tribble
- Tricorder (Mark XII)