Ras or RAS may refer to: Arts and media 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 Organizations 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 Air Squadron, a flying club in the UK 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 Biology 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 Science and technology .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 then requiring new water supplies Registered Accessibility Specialist, an official in Texas who evaluates accessibility 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 People 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 Other uses Ras (fascism), a title for a regional leader in 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 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