| IA | Initial Appearance | 初始状态 |
| IA | Information Age | 信息时代 |
| IA | Iowa | 衣阿华 |
| IA | Indirect Addressing | 间接寻址 |
| IA | Intel Architecture | 英特尔架构 |
| IA | Instantly Available | 即时可用 |
| IA | Information Appliance | 信息家电 |
| IA | Information Appliances | 信息装置(设备) |
| IA | Intruder Alarm | 防盗报警 |
| IA | Iodine Affinity | 碘亲合力 |
| IA | Information Access | 信息存取 |
| IA | Intelligence Appliance | 智能家电 |
| IA | Internal Authentication | 内部认证 |
| IA | Internet Address | 因特网地址 |
| IA | Intake Air | 进气 |
| IA | immunoassay | 免疫测定法 |
| IA | information architect | 信息建构师 |
| IA | Iraqi Airways (IATA airline code) | 伊拉克航空公司(IATA航空公司代码) |
| IA | Irrigation Association | 灌溉协会 |
| IA | Indian Airlines | 印度航空公司 |
| IA | Industrial Attachment | 工业附件 |
| IA | Installation Accountant | 安装会计 |
| IA | Internet Access | Internet访问 |
| IA | Inter-Agency | 机构间 |
| IA | Interagency Agreement | 机构间协议 |
| IA | Institute of Aging | 老龄化研究所 |
| IA | Interface Adapter | 接口适配器 |
| IA | Intelligent Agent | 智能代理 |
| IA | Internal Affairs | 内部事务部 |
| IA | Indian Army | 印度陆军 |
| IA | Internet Appliance | 互联网设备 |
| IA | International Academy | 国际学院 |
| IA | Intelligence Assessment | 情报评估 |
| IA | Inspection Authorization | 检验授权书 |
| IA | Internet Audio | Internet音频 |
| IA | Internal Audit | 内部审计 |
| IA | Intraarterial | 动脉内 |
| IA | Internet Archive | Internet档案 |
| IA | Isaac Asimov (author) | 艾萨克·阿西莫夫(作者) |
| IA | Inspection AcadÉmique (France) | Inspection AcadÉmique (France) |
| IA | Instruction and Assessment | 指导和评估 |
| IA | Institute of Astronomy | 天文研究所 |
| IA | Investment Advisor | 投资顾问 |
| IA | Italian Army | 意大利陆军 |
| IA | Information Assistance | 信息援助 |
| IA | Immediate Action (Military) | 立即行动(军事) |
| IA | Immediately Avaliable | 立即可用 |
| IA | It's Academic | 它的学术 |
| IA | In Absentia (Latin: On Behalf of and in the Absence Of) | 在缺席(拉丁语:代表和缺席) |
| IA | Instrument Airplane | 仪表飞机 |
| IA | Initial Appraisal (USACE) | 初始评估(USACE) |
| IA | Incentive Award | 激励奖 |
| IA | Independent Assessment | 独立评估 |
| IA | Impulse Approximation (electron momentum density) | 脉冲近似(电子动量密度) |
| IA | Illegal alien | 非法外国人 |
| IA | Initial Authorization | 初始授权 |
| IA | Individual Augmentation | 个人增强功能 |
| IA | Issuing Agency | 发证机构 |
| IA | Implementing Agency | 执行局 |
| IA | Information Analyst | 信息分析师 |
| IA | Instrumentation Amplifier | 仪表放大器 |
| IA | Interface Agreement | 接口协议 |
| IA | Integrity Agreement | 诚信协议 |
| IA | Internet Alliance | 互联网联盟 |
| IA | Industrial Affiliates | 工业关联公司 |
| IA | Interval Arithmetic | 区间算术 |
| IA | Interface Architect | 接口架构师 |
| IA | Investigative Analyst | 调查分析员 |
| IA | Irritant Agent | 刺激剂 |
| IA | Industry Automation | 工业自动化 |
| IA | Instituti Albanologjik (Albanological Institute, Kosova) | 阿尔巴诺洛吉克研究所(科索瓦阿尔巴诺洛研究所) |
| IA | Indian Airways | 印度航空公司 |
| IA | Investment Analysis | 投资分析 |
| IA | Individual Augmentee | 个人增强型 |
| IA | Initial Action | 初始操作 |
| IA | Inherent Availability | 固有可用性 |
| IA | Incremental Analysis | 增量分析 |
| IA | Input Acknowledgement | 输入确认 |
| IA | Investment Agreement | 投资协议 |
| IA | Interface Analysis | 界面分析 |
| IA | International Alphabet | 国际字母表 |
| IA | Impact Assessment | 影响评估 |
| IA | Input Axis | 输入轴(Input Axis) |
| IA | Indicated Altitude | 指示海拔高度 |
| IA | Impedance Angle | 阻抗角 |
| IA | Intelligence Analyst | 情报分析员 |
| IA | Image Amplifier | 图像放大器 |
| IA | Interstellar Alliance (Babylon 5) | 星际联盟(巴比伦5) |
| IA | Iowa (US postal abbreviation) | 爱荷华州(美国邮政缩写) |
| IA | Information Architecture | 信息体系结构 |
| IA | Information Assurance | 信息保证 |
| IA | Industrial Archaeology | 工业考古学 |
| IA | International Affairs | 国际事务部 |
| IA | Im Auftrag (German: By Order) | Im Auftrag(德语:按订单) |
| IA | Instructional Assistant | 教学助理 |
| IA | Initial Appointment | 初次约会 |
| IA | Intelligence Amplification | 情报放大 |
| IA | Individual Account | 个人账户 |