- Registered Architect , a designer who is licensed by a government to practice architecture
- Research Assistant , a graduate student employed by a college or university for the purpose of academic research
- Resident Assistant , a college student charged with supervising students living in a residence hall
- Royal Academician a member of the Royal Academy , also known as the ''Royal Academy of Arts''
- Ra , the sun god of ancient Heliopolis
- Rā , personification of the sun in New Zealand Māori mythology
- Ra (Stargate) , a character from the film ''Stargate''
- Rå , a creature in Scandinavian mythology
- Alternate spelling of Roua , a Polynesian deity
- Short for Rakim
- Ra , the pseudonym of Raoul Sinier , a french digital painter and electronic musician.
- Ra , a nickname, and US based signature couture fashion clothing line endorsed by Robin Arcuri , a supermodel and actress.
- Registration Authority , maintenance agency is a body given the responsibility of maintaining lists of codes
- Regular Army , the permanent force of the United States Army that is maintained during peacetime
- Provisional Irish Republican Army (PIRA), as used by its sympathizers ("The 'RA")
- Rage Against The Machine , melodic Crossover -Band from L.A.
- Rise Against , melodic hardcore band from Chicago, Illinois, USA
- Rowing Australia , the governing body for the sport of rowing in Australia.
- Royal Artillery , a Corps of the British Army
- Ra (Norwegian Band) , a Norwegian psytrance act
- Ra (U.S. Band) , an American rock band
- The RA Foundation For Research & Analysis , A research foundation based in The Netherlands
- Ra (kana) , the Japanese kana ら and ラ
- Radium or Ra on the periodic table
- Ra (board Game) , a board game for three to five players designed by Reiner Knizia and based on ancient Egyptian culture
- Relation Algebra , a type of mathemtical structure
- RemoteAccess BBS software
- Resettlement Administration , a New Deal program under Franklin D. Roosevelt
- Resident Advisor , an online electronic music magazine dedicated to the global dance music scene
- Revenue Assurance , a niche business activity most commonly undertaken within businesses that provide telecommunication services
- Rheumatoid Arthritis , a chronic, inflammatory autoimmune disorder that causes the immune system to attack the joints
- '' Rocket Arena '', a free mod for the multiplayer first-person shooter Quake series
- Nepal Airlines , IATA code
- A half-step below Re on the Solfege musical scale
- Ra I and Ra II, reed boats used by Thor Heyerdahl 's transatlantic expeditions
- Rayleigh Number , in physics
- The Winged Dragon Of Ra , from the Japanese Yu-Gi-Oh franchise
- Ra Cailum Class Battleship , a class of spaceships in the Gundam anime universe
- The file extension of a RealAudio file
- The abbreviation for
- The irreverent "Religious Advisor" of a Hash House Harriers club
- Ra , the first studio Album by the group Utopia
- RA0 to RA4 are ISO 217 standard paper sizes
- Radhiallahu 'anhu
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