| IAST | International Association for Strategic Thought | 国际战略思想协会 |
| IAST | Institute of Applied Science and Technology (Guyana) | 应用科学与技术研究所（圭亚那） |
| IAST | International Alphabet of Sanskrit Transliteration | 国际梵语转写字母的英语名称 |
| IAST | Initiative Against Sexual Trafficking | 打击性贩运倡议 |
| IAST | Industry Access Service Tariff | 行业准入服务关税 |