| IRAA | Investors Rights Association of America | 美国投资者权益协会 |
| IRAA | Indoor Radon Abatement Act | 室内氡消减法 |
| IRAA | International Registry of Artists and Artwork | 国际艺术家和艺术品登记处 |
| IRAA | Integrated Regional Appraisal and Assessment | 综合区域评估 |
| IRAA | Internal Reference Amino Acid | 内部参考氨基酸 |
| IRAA | Immigration Restructuring and Accountability Act of 1999 | 1999年移民重组和问责法案 |