TPI
- MNCTV
- TPI Polene
- TPI Specialties
- TPI test
- TPI theory
- Tangail Polytechnic Institute
- Tapini Airport
- Tarup-Paarup IF
- Ted Petty Invitational
- Tehran Psychiatric Institute
- Thread count
- Threads per inch
- Tianyin Pharmaceutical
- Tibet Policy Institute
- Tire Pressure Indicator
- Tok Pisin
- Town Planning Institute
- Tracks per inch
- Trading Places International
- Triebold Paleontology Incorporated
- Triosephosphate isomerase
- True Performance Index
- Tube Products of India
- Twist per inch
- Two person integrity