Organizations
- The Minerals, Metals & Materials Society, a professional organization for materials scientists and engineers
- Texas Memory Systems, a manufacturer of solid-state drives
- Tokyo Movie Shinsha, a major Japanese animation studio now known as TMS Entertainment
- Toronto Montessori Schools, a Montessori school in Richmond Hill, Ontario
- Toyota Motor Sales, U.S.A., Inc., an American subsidiary of Toyota Motor Corporation
- Tribune Media Services, a syndication company owned by the Tribune Company
- Trinity Mathematical Society, the oldest mathematical university society in the United Kingdom
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