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 Research and Analysis Service, India 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
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 supergroup or SAR supergroup, a eukaryote clade 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 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
People Ras (surname), several people Ras, nickname for the given name of Rasmus (given name) Ras Muhamad (born 1982), Indonesian reggae singer Ras Sheehama (1966–2025), Namibian reggae musician Nicholas Furlong (musician) (born 1986), known as RAS, American singer, songwriter, rapper, and record producer
Fictional characters Ra's al Ghul, a fictional villain in Batman media Rassius "Ras" Luine, a character from Tales of Eternia Ras (Ninjago), character in Ninjago
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 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
See also Ra (disambiguation) Rass (disambiguation) Raz (disambiguation) Rasa (disambiguation)