Os
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Os or OS could signify
- The os is each end of the cervix, internal (to the uterus) and external (to the vagina)
- A municipality of the county Hedmark in Norway, see Os, Hedmark.
- A municipality of the county Hordaland in Norway, see Os, Hordaland.
- The symbol for the chemical element Osmium (Os).
- Operating system (OS)
- Open Source
- Ordnance Survey
- Old Style Julian Calendar
- oculus sinister (OS) - left eye
- Ossetian language (ISO 639 alpha-2, os)
- The Anglo-Saxon ᚩ rune. One of the Aesir
- the IATA code for Austrian Airlines
- A Japanese manufacturer of Model Airplane engines Ogawa Seiki
- A football team from Norway established 1905.