| IACS | International Association of Catalysis Societies | 国际催化学会联合会 |
| IACS | International Association of Classification Societies | 国际船级协会 |
| IACS | Illinois Association For College Stores | 伊利诺伊大学商店协会 |
| IACS | International Association Of Counseling Services | 国际咨询服务协会 |
| IACS | Illinois Association Of College Stores | 伊利诺伊大学商店协会 |
| IACS | Indian Association for the Cultivation of Science | 印度科学培育协会 |
| IACS | Illinois Association of Convenience Stores | 伊利诺伊便利店协会 |
| IACS | International Association of Chemical Societies | 国际化学学会协会 |
| IACS | Illinois Association of Christian Schools | 伊利诺伊州基督教学校协会 |
| IACS | Iranian-American Cultural Society of Maryland, Inc. | 马里兰州伊朗裔美国人文化协会。 |
| IACS | International Association of Counseling Services, Inc. (Alexandria, VA) | 国际咨询服务协会（弗吉尼亚州亚历山大） |
| IACS | International Academy of Cardiovascular Sciences (Minnetonka, MN) | 国际心血管科学院（明尼苏达州明尼通卡） |
| IACS | Integrated Administration and Control System (EU system to administer payments under the common agricultural policy) | 综合管理和控制系统（欧盟根据共同农业政策管理支付的系统） |
| IACS | Industrial Automation and Control Systems | 工业自动化和控制系统 |
| IACS | Installation Access Control System | 安装访问控制系统 |
| IACS | Integrated Armament Control System | 综合军械控制系统 |
| IACS | Integrated Administration And Control System | 综合管理和控制系统 |
| IACS | International Annealed Copper Standard for conductivity | 国际退火铜电导率标准 |
| IACS | Integrated Acoustic Communications System | 综合声通信系统 |
| IACS | Intelligence Acoustic Communication System (US DoD) | 情报声学通信系统（美国国防部） |
| IACS | Informatique AvancÉe Communication et Services (French) | Informatique AvancÉe Communication et Services (French) |
| IACS | Information, Assurance & Certification Services (CESG, UK) | 信息,保证和认证服务(CESG、英国) |
| IACS | Integrated Avionics Control System | 综合航空电子控制系统 |