Internationally
- Tajikistan Support Project, foundation helping healthcare projects in Tajikistan
- Telecomunicacoes de Sao Paulo S.A., Brazilian telecommunications company trading on New York Stock Exchange with symbol "TSP"
- Texas Star Party, one of three major annual star parties in the USA
- TSP, IATA airport code for Tehachapi Municipal Airport, California, USA
- Three-Self Patriotic Movement, government-sanctioned Christian movement in the People's Republic of China
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