| HIO | Health Insuring Organization | 健康保险组织 |
| HIO | Health Information Organization | 卫生信息组织 |
| HIO | Horse Industry Organization | 马业组织 |
| HIO | High Intensity Operations | 高强度作业 |
| HIO | Horse Inspection Organization (inspects walking horses at horse shows) | 马匹检查组织(在马展上检查走马) |
| HIO | Harvard International Office | 哈佛国际办公室 |
| HIO | Hogere Informatica-Opleiding | Hogere Informatica操作 |
| HIO | Hole-In-One (chiropractic) | 一对一(脊椎按摩) |
| HIO | High Income Opportunities | 高收入机会 |
| HIO | High Income Opportunity Fund, Inc. | 高收入机会基金公司。 |
| HIO | hypoiodite(salt of hypoiodous acid) | 次碘酸盐 |
| HIO | hypoiodism | 低碘血症 |
| HIO | Hillsboro, Oregon USA | 美国俄勒冈州希尔斯伯勒 |