| IMO | in my opinion | 我认为 |
| IMO | international marine organization | 国际海事组织 |
| IMO | International Meteorological Organization | 国际气象组织 |
| IMO | International Money Orders | 国际汇票 |
| IMO | in my humble opinion | 恕我直言 |
| IMO | Interband Magneto-Optic Effect | 带间磁光效应 |
| IMO | Institut fÜr Mathematische Optimierung (Universität Magdeburg, Germany) | Institut fÜr Mathematische Optimierung (Universität Magdeburg, Germany) |
| IMO | In Memory Of | 为了纪念 |
| IMO | Intermediate Math Open | 中级数学公开课 |
| IMO | Irish Medical Organisation | 爱尔兰医疗组织 |
| IMO | Incident Management Officer | 事件管理官 |
| IMO | Intergovernmental Maritime Organization (obsolete) | 政府间海事组织(已过时) |
| IMO | International Mathematical Olympiad | 奥林匹克数学竞赛 |
| IMO | International Meteor Organization | 国际流星组织 |
| IMO | Interactive Mathematics Online | 交互式数学在线 |
| IMO | Independent Marketing Organization (insurance) | 独立营销机构(保险) |
| IMO | Information Media Outlet | 信息媒体出口 |
| IMO | International Money Order | 国际汇票 |
| IMO | Immune Modulatory Oligonucleotides | 免疫调节寡核苷酸 |
| IMO | I My Opinion | 我的看法 |
| IMO | In My Opening | 在我的开场白中 |
| IMO | Information Management Office | 信息管理办公室 |
| IMO | Imperial Oil, LTD. | 帝国石油有限公司。 |
| IMO | International Mathematics Olympiad | 国际奥林匹克数学竞赛 |
| IMO | Input Manipulation And Output | 输入操纵和输出 |
| IMO | Intravenous Membrane Oxygenator | 静脉膜氧合器 |
| IMO | Ice Man's Obituary | 冰的男人的讣告 |
| IMO | In Mijn Ogen (Dutch: in My Eyes) | 在Mijn Ogen(荷兰语:在我眼中) |
| IMO | Independent Electricity Market Operator | 独立电力市场运营商 |
| IMO | Imaobong Missionary Outreach | Imaobong宣教外展 |
| IMO | Im Moment (German: In This Moment) | Im Moment(德语:In This Moment) |
| IMO | Instant Money-Order | 即时汇款单 |
| IMO | Insaat MÜhendisleri Odasi (Turkish: Chambers of Civil Engineering) | Insaat MÜhendisleri Odasi (Turkish: Chambers of Civil Engineering) |
| IMO | Installation Management Office | 安装管理办公室 |
| IMO | Information Management Officer | 信息管理军官 |
| IMO | Integrated Molecular Orbital | 集成分子轨道 |
| IMO | Intelink Management Office (US DoD) | 互联网管理办公室(美国国防部) |
| IMO | Independent Market Operator | 独立市场运营商 |
| IMO | Installation Maintenance Officer | 设施维修官 |
| IMO | Intensive Management Office | 强化管理办公室 |
| IMO | Internet Mail Only | 仅Internet邮件 |
| IMO | Idaho Mounted Orienteering (club) | 爱达荷州骑马定向越野(俱乐部) |
| IMO | International Market Opportunities | 国际市场机会 |
| IMO | Intramural Order | 校内订单 |
| IMO | Installation Mobility Officer | 设施机动官 |
| IMO | I'm Moving On | 我向前 |
| IMO | Into Members Only | 仅限于成员 |