Atsa may stand for:
Places
- Atsa, a village in Haddinnet municipality, Ethiopia
Acronyms ATSA
- ATSA (airline) (Aero Transporte S.A.), a Peruvian airline
- Association for the Treatment and Prevention of Sexual Abuse, an international organisation
- Aviation and Transportation Security Act, United States legislation of 2001
- Army Technical Support Agency, British defence research establishment 1982-1995
- Association of Togolese Students in America
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