Organizations
- S.A. (corporation), a type of corporation in various countries
- Military and paramilitary organisations and ranks
- Seaman apprentice, US navy and coastguard rank
- Sherut Avir, the air branch of the Haganah
- Soviet Army (Советская Армия, Sovetskaya Armiya)
- Sturmabteilung, a paramilitary wing of the Nazi Party in Nazi Germany
- Political organisations
- Socialist Action (disambiguation), several organisations
- Socialist Alliance (Australia), a Socialist political party
- Socialist Alliance (England), a political party in England
- Socialist Alternative (Australia), a Marxist political organisation
- Other
- Salvation Army, a Christian denomination founded by William Booth
- Sexaholics Anonymous, a sex-addiction recovery group based on the 12-steps of AA
- Success Academy Charter Schools, term commonly abbreviated to 'Success Academy'
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