| ECO | Engineering Change Order | 工程改动要求(客户) |
| ECO | English Chamber Orchestra | 英国室内乐团 |
| ECO | Emergency Changeover Order | 紧急转换命令 |
| ECO | Epichlorohydrin Rubber | 氯醇橡胶 |
| ECO | European Certifying Organization SpA (Italy) | 欧洲认证组织SpA（意大利） |
| ECO | Economic Cooperation Organization | 经济合作组织 |
| ECO | Entry Clearance Officer (UK immigration) | 入境检查官（英国移民） |
| ECO | El Encanto, Colombia | 哥伦比亚El Encanto |
| ECO | Electron-Coupled Oscillator | 电子耦合振荡器 |
| ECO | Ecology | 生态学 |
| ECO | Energy Committed To Offenders | 致力于罪犯的精力 |
| ECO | Energy Cost Optimization | 能源成本优化 |
| ECO | Entry Control Officer (UK fire service) | 入境管制主任（英国消防局） |
| ECO | Earth Communication Office | 地球通信办公室 |
| ECO | Electronic Central Office | 电子中心办公室 |
| ECO | electronic combat officer (US DoD) | 电子作战军官（美国国防部） |
| ECO | Environmental Compliance Organization International LLC (Portland, OR) | 环境合规组织国际有限责任公司（俄勒冈州波特兰） |
| ECO | Enterprise Core Objects | 企业核心对象 |
| ECO | Emergency Control Officer | 应急控制官 |
| ECO | Economic Competitive Opportunity | 经济竞争机会 |
| ECO | Early Childhood Outcomes | 幼儿期结果 |
| ECO | Extraordinary Customer Opportunity (Sprint) | 非凡的客户机会（Sprint） |
| ECO | Embedded Communication Object | 嵌入式通信对象 |
| ECO | Ethernet Connection (NEC) | 以太网连接（NEC） |
| ECO | Elected County Official | 当选县官员 |
| ECO | ECORAIL Incorporated | Ecorail公司 |
| ECO | Echo Bay Mines, LTD. | 回音湾矿业有限公司。 |
| ECO | Evolving Creative Opportunities | 不断发展的创新机会 |
| ECO | Equipment Control Officer | 设备控制官 |
| ECO | Emergency Coordinating Officer | 应急协调官 |
| ECO | Ecological | 生态的 |
| ECO | Enterprise Customer Optimization | 企业客户优化 |
| ECO | Environmental Commissioner of Ontario (Canada) | 安大略省环境专员（加拿大） |
| ECO | Environmental Conservation Organization | 环境保护组织 |
| ECO | Environmental and Conservation Organisations (of Aotearoa, New Zealand) | 环境和保护组织（新西兰奥泰拉阿） |
| ECO | Environmental Caring Organization | 环境关爱组织 |
| ECO | Enterprise Core Object | 企业核心对象 |
| ECO | Emergency Changeover Order signal (CCS #7 & ITU-T) | 紧急转换为信号(CCS % 26 # 7讨论) |
| ECO | Embarkation Control Office | 登船管制办公室 |
| ECO | Estudios Comerciales De OpiniÓn | Estudios Comerciales De OpiniÓn |
| ECO | Emergency Custody Order (mental health) | 紧急监护令（精神健康） |
| ECO | Encyclopedia of Chess Openings | 国际象棋公开赛百科全书 |
| ECO | Electronic Control (Sprint) | 电子控制（Sprint） |
| ECO | Engine Certification Office (FAA) | 发动机认证办公室（FAA） |
| ECO | Enhanced Connectivity Options (AT&T) | 增强的连接性(AT&T)的选项 |
| ECO | Earls Court and Olympia (London, England) | 厄尔斯法院和奥林匹亚（英国伦敦） |
| ECO | Environmental Careers Organization | 环境职业组织 |
| ECO | Energy Cut Off | 能量切断 |
| ECO | Equitable Consideration Offer (IRS) | 公平对价要约（IRS） |
| ECO | Environmental Control Organization | 环境控制组织 |
| ECO | Experiment in Construction with Object-Oriented Methods | 用面向对象方法进行建筑实验 |
| ECO | English And Cultural Orientation | 英语与文化取向 |
| ECO | Early Canadiana Online (digital library) | 早期Canadiana Online（数字图书馆） |
| ECO | Electronic Collections Online | 电子期刊馆藏联机 |
| ECO | Epichlorohydrin Rubber (Ethylene Oxide Copolymer) | 环氧氯丙烷橡胶（环氧乙烷共聚物） |
| ECO | Earth Communications Office | 地球通信办公室 |
| ECO | Elite Combat Operatives (gaming clan) | 精英战斗操作员（游戏部落） |
| ECO | Engineering, Construction & Operations | 工程、建筑和操作 |
| ECO | Edison-Chouest Offshore | Edison Chouest海上 |
| ECO | Equity Carve-Out | 股权分割 |
| ECO | Ex Caelis Oblatus | 前Caelis Oblatus |
| ECO | Ecological Scenario | 生态情景 |
| ECO | Edit Change Order | 编辑变更单 |
| ECO | Execution and Control of Operations | 操作的执行和控制 |
| ECO | Engagement Control Officer (Tomahawk) | 交战控制官（战斧） |
| ECO | Equal Competitive Opportunity (FCC) | 平等竞争机会（FCC） |
| ECO | Environmental Career Opportunities | 环境职业机会 |
| ECO | End Central Office (NARTE) | 终端中心办公室（NARTE） |
| ECO | Earth Crossing Objects | 地球交叉物体 |
| ECO | Electioneering Communication Organizations | 选举传播组织 |
| ECO | Export Control Organization (UK) | 出口管制组织（英国） |
| ECO | European Communications Office | 欧洲通信办公室 |