People, Groups, and Organizations
- Railway Mail Service, US mail transportation service until the mid-20th century
- Ramanujan Mathematical Society
- Regroupement des militants syndicaux, a political organization
- Republik Maluku Selatan, a separatist movement in Indonesia that proclaimed an independent "Republic of the South Moluccas" in the 1950s
- Richard Matthew Stallman (sometimes abbreviated "rms"), founder of the GNU Project
- Roads and Maritime Services
- Royal Medical Society
- Royal Meteorological Society
- Royal Microscopical Society, at the forefront of new ideas and developments in microscopy and imaging
- Royal Society of Miniature Painters Sculptors and Gravers, known as the Royal Miniatures Society
- RMS (band), a jazz/rock fusion band
- Russian Mineralogical Society
- Russian Musical Society, an organisation founded in 1859 and disbanded in 1917.
- Records Management Society, now known as the Information and Records Management Society.
Read more about this topic: RMS