RSA may refer to:
Organizations Academia and education Rabbinical Seminary of America, a yeshiva in New York City Regional Science Association International (formerly the Regional Science Association), a US-based learned society Renaissance Society of America, a scholarly organization based in New York City Rhetoric Society of America, an academic organization for the study of rhetoric Royal Scottish Academy, a Scottish institute of the Arts Royal Society of Arts, a British charitable organisation, formally the Royal Society for the Encouragement of Arts, Manufactures and Commerce
Military Redstone Arsenal, a United States Army post adjacent to Huntsville, Alabama Royal New Zealand Returned and Services' Association, an organization for the welfare of veterans of New Zealand's military Royal School of Artillery, a British Army training establishment for artillery warfare Royal Serbian Army (1882–1918), army of the Kingdom of Serbia Royal Signals Association, an organization for serving and retired members of the Royal Corps of Signals, of the British Army
Other organizations RSA Insurance Group (Royal and Sun Alliance), United Kingdom RSA Security, a US network security company Rehabilitation Services Administration, a US Department of Education agency Retirement Systems of Alabama, US Ridley Scott Associates, a UK film company Road Safety Authority, Ireland Russian Ski Association
Places Republic of South Africa, IOC country code Santa Rosa Airport (Argentina), in La Pampa province (IATA code RSA)
In science and technology Biology, organic chemistry, and medicine Respiratory sinus arrhythmia, the heart rate variation due to respiration Retrosynthetic analysis, in organic chemistry Rsa RNA, partially characterised non-coding RNA from Staphylococcus aureus Root System Architecture
Cryptography and security RSA (cryptosystem) (Rivest–Shamir–Adleman), for public-key encryption RSA Conference, annual gathering RSA Factoring Challenge, for factoring a set of semi-prime numbers RSA numbers, with two prime numbers as factors
Other uses in science and technology RSA (missile), a Swiss-developed surface-to-air missile system Rational Software Architect, part of IBM Rational Application Developer Remote supervisor adapter, an out-of-band management interface on IBM servers Revolver Stechkina-Avraamova, a designation of the Russian OTs-01 Kobalt revolver Roentgen stereophotogrammetric analysis, also called radiostereometric analysis, a method of calculating 3D orientation using X-ray images The Rational Speech Act framework in the study of pragmatics
Other uses Ray Steadman-Allen, a composer of music Repressive state apparatuses, a concept in Louis Althusser's philosophy Responsible Service of Alcohol, alcohol server training in several Australian states , French benefit for low-paid workers New Hampshire Revised Statutes Annotated, an entire body of laws Runway safety area, or runway end safety area, for aircraft