| HAI | Helicopter Association International | 世界直升机协会 |
| HAI | Hotel Association of India | 印度酒店协会 |
| HAI | High Amp Arc Ignition | 高安培电弧点火 |
| HAI | Hotel Adelaide International | 阿德莱德国际酒店 |
| HAI | Hampton Industries, Inc. | 汉普顿工业公司。 |
| HAI | Histology Activity Index (Knodell Score) | 组织学活性指数（Knodell评分） |
| HAI | hepatic arterial infusion | 肝动脉输注 |
| HAI | humoral antibody immunity | 体液抗体免疫 |
| HAI | hydroxy-acid iodide | 羟基酸碘化物 |
| HAI | Hot Air Injection | 热空气喷射 |
| HAI | Horizontal Advance Increment | 水平前进增量 |
| HAI | Handbook of Artificial Intelligence | 人工智能手册 |
| HAI | High Altitude Indoctrination | 高空诱导 |
| HAI | Hellenic Aerospace Industry | 希腊航空航天工业 |
| HAI | Hospital Acquired Infection | 医院获得性感染 |
| HAI | Human Awareness Institute | 人类意识研究所 |
| HAI | Higher Authority of Intelligence | 高级情报局 |
| HAI | hemagglutination inhibition | 血凝抑制 |
| HAI | Hepatic Arterial Infusion (therapy) | 肝动脉灌注（治疗） |
| HAI | Healthcare-Associated Infections | 医疗保健相关感染 |
| HAI | Health Action International | 国际卫生行动 |
| HAI | Human Appeal International | 国际人类呼吁 |
| HAI | Haida | 海达 |
| HAI | Hepatic Activity Index | 肝活动指数 |
| HAI | hemagglutinin inhibition | 血凝素抑制 |
| HAI | Hemagglutination Inhibition (Immune assay type, microbiology) | 血凝素抑制（免疫测定类型，微生物学） |
| HAI | High-Current Arc Ignition | 大电流电弧点火 |
| HAI | Healthcare-Acquired Infection | 医疗保健获得性感染 |
| HAI | High-Level Analog Input | 高电平模拟输入 |