RAA
- Ralph Appelbaum Associates
- Recreation and Amusement Association, a system of brothels set up by the Japanese government for US occupation forces
- Recreational Aircraft Association
- Recreational Aviation Australia
- Reductio ad absurdum
- Reeve Aleutian Airways
- Regional Airline Association (USA)
- Renin-Angiotensin-Aldosterone system
- Research on Armenian Architecture
- Research & Academic Architecture, PC
- Riksantikvarieämbetet (National Heritage Board of Sweden)
- Right atrial appendage
- Rise Against Alliansen (Swedish supporters of the band Rise Against)
- Royal Australian Artillery, a corps in the Australian Army
- Royal Automobile Association
- Ruby Application Archive
- The Rural Alberta Advantage, a Canadian indie band
- Onomatopoeic description of the sound that a beast makes when expelling a terrifying roar.
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