Look up ras, Ras, RAS, rás, râs, rãs, rǡs, răs-, or Raś in Wiktionary, the free dictionary.

Ras or RAS may refer to:

• RAS Records Real Authentic Sound, a reggae record label
• Rundfunk Anstalt Südtirol, a south Tyrolese public broadcasting service
• Rás 1, an Icelandic radio station
• Rás 2, an Icelandic radio station
• Raise A Suilen, a Japanese band

• Railway Air Services, a UK airline
• Rajasthan Administrative Service, India
• Remote Astronomical Society Observatory of New Mexico
• Richard Allen Schools, a charter school system in Ohio, USA
• Richardson Adventist School, now North Dallas Adventist Academy
• IEEE Robotics and Automation Society
• Royal American Shows, an American travelling carnival company operating from the 1920s to the 1990s
• Royal Asiatic Society of Great Britain and Ireland
• Royal Astronomical Society, UK, founded 1820
• Russian Academy of Sciences

• RAAS, the renin–angiotensin system, a hormone system that regulates blood pressure
• Recurrent aphthous stomatitis or canker sores
• Renal artery stenosis, the narrowing of the renal arteries
• Respiratory airway secretory cell, cells in humans and some other mammals that maintain airway health
• Reticular activating system in the brain, regulating wakefulness
• Retinoic acid syndrome, a complication of acute promyelocytic leukemia
• Ras superfamily, a superfamily of signalling proteins
  • Ras subfamily, a family of signalling proteins

• .ras, a SunOS raster format
• RAS algorithm, an algorithm for iterative proportional fitting in economics
• RAS supergroup or SAR supergroup, a plant clade
• Recirculating aquaculture system, an aquarium system that filters water rather than requiring new water supplies
• Registration, Admission and Status, a telephony protocol under H.323
• Reliability, availability and serviceability of computer hardware
• Remote access service, on a network
• Reusable Asset Specification of software
• Row Address Strobe in dynamic random-access memory
• Russian Accounting Standards

• Ras (surname), several people
• Ras, the nickname for someone with the given name of Rasmus (given name)
• Ra's al Ghul, a fictional villain in Batman media
• Ras Muhamad (born 1982), Indonesian reggae singer
• Nicholas Furlong (musician) or Ras
• Rassius "Ras" Luine, a character from Tales of Eternia
• Ras (Ninjago), character in Ninjago

• Ras (fascism), a title for a regional leader in Ethiopia under fascist Italy
• Ras (title), an Ethiopian aristocratic and court title, as in Ras Tafari
• Ras cheese, a variety popular in Egypt
• RAS syndrome, "redundant acronym syndrome" syndrome
• Reasonable articulable suspicion, a burden of proof in the United States legal system
• Rás Tailteann, an annual cycling race in Ireland
• Stari Ras, a capital city of medieval Serbian state of Raška
• Replenishment at sea, providing naval ships with supplies while at sea
• Catepanate of Ras, province of the Byzantine Empire

• Ra (disambiguation)
• Rass (disambiguation)
• Raz (disambiguation)
• Rasa (disambiguation)

This disambiguation page lists articles associated with the title Ras.
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