TPI may refer to:
Medicine Tehran Psychiatric Institute, an Iranian research institute Tianyin Pharmaceutical, a Chinese pharmaceutical company TPI test, used to detect presence of Treponema pallidum bacteria Triosephosphate isomerase, an enzyme
Technology Tire Pressure Indicator, a product by NIRA Dynamics AB TPI Specialties, an American auto parts manufacturer True Performance Index, a measurement for AMD processors Teeth per inch, on a saw blade Thermoplastic polyimide, a type of plastic
Units of measure Thread count, or threads per inch, used in the textile industry Threads per inch, used with threaded fasteners Tracks per inch, of magnetic storage media Twist per inch, or turns per inch, used in the textile industry
Other uses MNCTV, an Indonesian television network formerly named TPI (Televisi Pendidikan Indonesia) Tangail Polytechnic Institute, in Bangladesh Tapini Airport, in Papua New Guinea Tarup-Paarup IF, a Danish association football club Ted Petty Invitational, an independent wrestling tournament in North America The Post Internazionale, an Italian magazine Tibet Policy Institute, a think tank of the Central Tibetan Administration Tok Pisin, a language of Papua New Guinea Town Planning Institute, later the Royal Town Planning Institute, a professional organisation in the United Kingdom TPI Polene, a Thai cement manufacturer TPI theory, in human resource management Trading Places International, an American vacation services corporation Triebold Paleontology Incorporated, an American fossil company Tube Products of India, an Indian steel manufacturer Two person integrity, a communications security measure