| ATSA | Accountants Technology Showcase Australia 
| Others |
| ATSA | Action Terroriste Socialement Acceptable
| Others |
| ATSA | ADTRAN Technical Solutions Associate
| Others |
| ATSA | ADTRAN Technical Support Associate
| Others |
| ATSA | Aero Tech Service Associates
| Others |
| ATSA | American Tornado Shelter Assoc
| Others |
| ATSA | American Tornado Shelter Association
| Others |
| ATSA | American Translation Studies Association
| Others |
| ATSA | Army Technical Support Agency
| Others |
| ATSA | Association for the Treatment of Sexual Abusers
| Others |
| ATSA | Association for Translation Studies in Africa
| Others |
| ATSA | Association of Togolese Students in America
| Others |
| ATSA | Automotive Transportation Supervisors Association
| Others |
| ATSA | Aviation and Transportation Security Act
| Others |