| MHRA | Marine Hills Recreation Association | 海洋山娱乐协会 |
| MHRA | Minority Human Resources Association (Wisconsin) | 少数民族人力资源协会（威斯康星州） |
| MHRA | Melrose Hall Residents Association (University of Tennessee) | 梅尔罗斯霍尔居民协会（田纳西大学） |
| MHRA | Media Human Resources Association | 媒体人力资源协会 |
| MHRA | Modern Humanities Research Association (United Kingdom) | 现代人文研究协会（英国） |
| MHRA | Massachusetts Housing Rental Association | 马萨诸塞州住房租赁协会 |
| MHRA | Medical and Health Research Association of New York City | 纽约市医学与健康研究协会 |
| MHRA | Malta Hotels and Restaurants Association | 马耳他酒店和餐厅协会 |
| MHRA | Mental Health Resource Associates, PC | 心理健康资源协会 |
| MHRA | Michigan Hydroplane Racing Association | 密歇根水上飞机赛车协会 |
| MHRA | Mental Health Referral Associates (Washington capital area) | 心理健康转介协会（华盛顿首都地区） |
| MHRA | Multihull Racing Association | 多船体赛车协会 |
| MHRA | Michigan Hot Rod Association | 密歇根州热棒协会 |
| MHRA | Miniature Hot Rod Association | 微型热棒协会 |
| MHRA | Michiana Horse and Rider Association (Indiana/Michigan) | Michiana马和骑手协会(印地安那州/密西根州) |
| MHRA | Maximum Hourly Rolling Average | 最大小时滚动平均值 |
| MHRA | Minnesota Human Rights Act | 明尼苏达州人权法案 |
| MHRA | Manufactured Housing Research Alliance | 人造住房研究联盟 |
| MHRA | Medicines and Healthcare Products Regulatory Agency | 药品和保健品管理局 |
| MHRA | Mountain High River Adventures Inc. (Canada) | Mountain High River Adventures Inc.（加拿大） |
| MHRA | Minneapolis Housing and Redevelopment Authority | 明尼阿波利斯住房和重建局 |
| MHRA | Managing Health Related Absences (Canada) | 管理健康相关缺勤（加拿大） |
| MHRA | Maine Human Rights Act | 缅因州人权法案 |
| MHRA | Missouri Human Rights Act | 密苏里州人权法案 |