TMSS

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