TMSS may refer to:
- Two-Micron Sky Survey, an infrared astronomical survey and catalog
- Taiwanese Modern Spelling System, the basis for the Modern Literal Taiwanese orthography
- Trademark Security System, a copyright protection mechanism used by Sega that was subject of the 1992 Sega v. Accolade court case
- Thengamara Mohila Sabuj Sangha, third largest non-governmental organisation (NGO) in Bangladesh
This disambiguation page lists articles associated with the title TMSS.
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