| HDA | high-efficiency Audax High Definition Aerogel | 高效高清楚气动 |
| HDA | Head Disk Assembly | 头盘组件 |
| HDA | Helicase-dependent amplification.pdf | 解链酶扩增 |
| HDA | Hampshire Deaf Association (UK) | 汉普郡聋人协会（英国） |
| HDA | Hispanic Dental Association | 西班牙裔牙科协会 |
| HDA | Hardwood Distributor's Association | 经销商协会硬木 |
| HDA | Holistic Dental Association | 整体牙科协会 |
| HDA | Hawaii Dental Association | 夏威夷牙科协会 |
| HDA | Humanitarian Daily Rations | 人道主义每日口粮 |
| HDA | Hidden Falls, Alaska USA | 隐藏瀑布，美国阿拉斯加州 |
| HDA | Housing Development Agency | 住房发展局 |
| HDA | High Definition Amplifier | 高清晰度放大器 |
| HDA | Hydroxy Decanoic Acid | 羟基癸酸 |
| HDA | Heads, Actuator, Frame and Discs | 头部、致动器、框架和阀盘 |
| HDA | heptadecanoic acid | 十七烷酸 |
| HDA | Historical Data Access | 历史数据访问 |
| HDA | Havent Decided A | 尚未决定A |
| HDA | Head-Disk Assembl | 头盘组件 |
| HDA | Hometown Democracy Amendment | 家乡民主修正案 |
| HDA | History Data Access | 历史数据访问 |
| HDA | Hemispherical Dielectric Antenna | 半球形介质天线 |
| HDA | Hail Detection Algorithm | 冰雹检测算法 |
| HDA | Health Development Agency (UK NHS) | 健康发展局（英国NHS） |
| HDA | High Definition Audio | 高清晰度音频 |
| HDA | High Density Alloy | 高密度合金 |
| HDA | Horizontal Distribution Area | 水平分布区域 |
| HDA | Hot Dipped Aluminized paint | 热浸镀铝漆 |
| HDA | Hard Decision-Aided | 硬决策辅助 |
| HDA | Higher Duties Allowance (Australia; pay for performing duties above employed position) | 更高的职务津贴（澳大利亚；为履行职务以上的职务支付工资） |
| HDA | Hierarchical Decoding Algorithm | 分层解码算法 |
| HDA | Hybrid Digital-Analog | 混合数字模拟 |
| HDA | Help Desk Analyst | 帮助台分析员 |
| HDA | Hexamethylene Diamine | 六亚甲基二胺 |
| HDA | High Density Area | 高密度区域 |
| HDA | Hard Disk Assembly | 硬盘组件 |