TMM
- AJR
- TMM-1 mine
- Tell Me More
- Tell Me More (software)
- Testing Maturity Model
- Texas Memorial Museum
- Textbook of Military Medicine
- The Maybe Man
- The Music Machine (radio station)
- Theresa May
- Too Much Media
- Traffic Management Microkernel
- Transfer-matrix method (optics)
- Transfer-matrix method (statistical mechanics)
- Translation memory manager
- Trimethylenemethane
- Turkmenistani manat