Organizations
- Transportation Security Administration, in the United States Department of Homeland Security
- Taos Society of Artists, an historic organization of visual artists
- Tattnall Square Academy, a private school located in Macon, Georgia, United States
- Technology Student Association, organization of technology students
- Tenant Services Authority, a United Kingdom regulatory body
- Texas Soaring Association, a glider club near Dallas, Texas
- Thai Student Association, a group of organizations for expatriate Thai students
- The Salvation Army, an international Christian Church and Community Service Provider
- The Scout Association in the United Kingdom
- The Sharon Academy, a middle/high school in Vermont, United States
- Theosophical Society Adyar, successor of the 1875 Theosophical Society
- Theosophical Society in America, affiliated with the Theosophical Society Adyar
- Tourette Syndrome Association, advocacy organization
- Trans States Airlines, a United States regional airline
- Tulane School of Architecture in New Orleans, Louisiana
- Toilet Safety Administration, a parody of the Transportation Security Administration in the TV episode "Reverse Cowgirl" (South Park)
Read more about this topic: TSA