Organizations
- Debating SA Incorporated, a South Australian organisation that conducts debating activities
- Defence Security Authority
- Democratic Socialists of America, an offshoot of the historic Socialist Party of America established in 1982
- Department of Social Affairs of the fictional British Government from the television comedy satire The Thick of It
- Development Studies Association
- Down's Syndrome Association, UK charity
- Driving Standards Agency, an executive agency of the British Department for Transport
- DSA Myanmar, Defense Services Academy
- Durham School of the Arts, a grades 6–12 public school in Durham, NC
- German School of Athens, also known as Deutsche Schule Athen
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