RAS may refer to:
- Royal Asiatic Society of Great Britain and Ireland, a society to further study into topics relating to science, literature, and the arts in relation to Asia
- RAS Records, a reggae record label
- Rescue Aid Society, a fictional society in the film The Rescuers
- RAS (film), a 1973 film by Yves Boisset
- Redundant Acronym Syndrome
- Radical Anti-Semitism
- Registered Accessibility Specialist
- Reliability, Availability and Serviceability
- Rundfunk Anstalt Südtirol, a public broadcaster whose purpose is to relay programming from Germany, Austria, and Switzerland to the German-speaking population
- Ras city, first capital city of medieval Serbian state of Raska
- Hans Ras (1926-2003) is a Dutch philologist
- The Rás (originally Rás Tailteann) is an annual cycling race in Ireland.
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Language
- In Hindi, depending on context, means juice, or nectar.
- A title in the Amharic language meaning "head," as in Ras Tafari; the term is often used by members of the Rastafari movement, e.g., Ras Mida. See: Ethiopian aristocratic and court titles.
- in Arabic means "head" and "cape" and appears in placenames like Ras Tanura. See the related title of Rais.
Science and technology
- Rail Adapter System; another name for the Picatinny Rail system used for mounting accessories on modern firearms
- RAS genes and RAS proteins implicated in development of cancer
- RAS coordinates (in medicine, a patient relative set of axis: Right/Left, Anterior/Posterior, Superior/Inferior the first of each couple corresponding to positive)
- Recirculating Aquaculture System, production of aquatic organisms in highly controlled aquatic environments
- Recurrent aphthous stomatitis
- Reflectance anisotropy spectroscopy
- Registration, Admission and Status
- Reliability, Availability and Serviceability, properties of memory system for enterprise.
- Remote Access Service
- Renal artery stenosis
- Renin-angiotensin system
- Replenishment at Sea
- Resource Allocation System, deadlock avoidance
- Reticular activating system
- Reusable Asset Specification, OMG Standard
- Royal Astronomical Society
- Royal Adelaide Show
- Row Address Strobe (less commonly: Row Address Signal or Row Address Select) input to dynamic random access memory (DRAM) indicating that the row address lines are valid.
- Russian Academy of Sciences
- Sun Raster, the native raster format of the SunOS Unix OS.
- Research and Advisory Services: IT analysis acronym to designate content and inquiry services offered by industry analyst firms.
Transport
- Roundabout Appreciation Society
- Replenishment at sea (RAS), a technique for replenishing a ship while under way
Comics
- Ras, or Ra's, is often a nickname for the Batman villain Ra's al Ghul, among comic book fans.
