| ATRA | All-trans-retinoic acid | 全反式维甲酸 |
| ATRA | Advanced Transit Association | 高级运输协会 |
| ATRA | Arizona Tax Research Association | 亚利桑那州税务研究协会 |
| ATRA | Auto and Truck Recyclers Association | 汽车和卡车回收商协会 |
| ATRA | Alberta Therapeutic Recreation Association | 阿尔伯塔省治疗娱乐协会 |
| ATRA | American Tort Reform Association | 美国侵权法改革协会 |
| ATRA | American Thai Ridgeback Association (Thai Ridgeback dog breed) | 美国-泰国驼背犬协会（泰国驼背犬品种） |
| ATRA | Alternative Transportation Recreational Association | 替代交通娱乐协会 |
| ATRA | American Track Racing Association | 美国田径协会 |
| ATRA | American Therapeutic Recreation Association (Alexandria, VA) | 美国治疗娱乐协会（弗吉尼亚州亚历山大市） |
| ATRA | Automatic Transmission Rebuilders Association | 自动变速器制造商协会 |
| ATRA | The Automatic Transmission Rebuilders Association | 自动变速器制造商协会 |
| ATRA | American Thailand Ridgeback Association | 美国泰国脊背鲸协会 |
| ATRA | Advanced Technology Reconnaissance Aircraft | 先进技术侦察机 |
| ATRA | Alberta Tobacco Reduction Alliance | 阿尔伯塔省减少烟草联盟 |
| ATRA | Army Recruiting and Training Agency (UK MoD) | 陆军征兵和训练局（英国国防部） |
| ATRA | Afghan Telecommunications Regulatory Authority | 阿富汗电信管理局 |
| ATRA | Airedale Terrier Rescue and Adoption (Michigan) | Airedale Terrier救援和收养（密歇根州） |
| ATRA | All-Trans Retinoic Acid (aka tretinoin) | 全反式维甲酸（又名维甲酸） |
| ATRA | Association Tortues Rhône-Alpes (French: Association of Rhone-Alps Tortoises | Association Tortues Rhône-Alpes (French: Association of Rhone-Alps Tortoises |
| ATRA | Assistive Technology Resource Alliance | 辅助技术资源联盟 |