| OC | Organizing Committee | 组织委员会 |
| OC | Office of Censorship | 检查处 |
| OC | open cover | 预约保险 |
| OC | Oriented Connection | 面向连接的方式 |
| OC | OXYGEN CUTTING | 气割 |
| OC | Officer Commanding | 指挥官 |
| OC | Open Cassette | 开放式卡匣 |
| OC | Over Current | 过电（流） |
| OC | Operation Code | 运算码 |
| OC | Oil Consumption | 润滑油消耗量 |
| OC | Oxidation Catalyst | 氧化触媒 |
| OC | Open Chamber | 开式燃烧室 |
| OC | open circuit | 断路 |
| OC | office copy | 公文正本 |
| OC | Open Cord | 开放型帘线 |
| OC | Optical Carrier | 光载波 |
| OC | Ocean Conservancy | 海洋保护协会 |
| OC | Operating Company | 运营公司 |
| OC | Optical Communications | 光通信 |
| OC | Oklahoma Christian University | 俄克拉荷马基督教大学 |
| OC | Obsessive-Compulsive | 强迫症 |
| OC | Oceanic Crust | 海洋地壳 |
| OC | Operating Curve | 工作曲线 |
| OC | Operational Control | 操作控制 |
| OC | Object Class | 对象类 |
| OC | Oversight Committee | 监督委员会 |
| OC | Organochlorine | 有机氯 |
| OC | Of Course | 当然 |
| OC | Over Crowded | 拥挤不堪 |
| OC | Out of Control | 失控 |
| OC | Operating Cost | 运营成本 |
| OC | Operational Capability | 作战能力 |
| OC | On Course | 在课程上 |
| OC | Overcurrent | 过电流 |
| OC | Overcoat | 大衣 |
| OC | Operation Center | 运营中心 |
| OC | Operator Console | 操作员控制台 |
| OC | Original Character (fanfiction new, made-up character) | 原创角色（虚构的新角色） |
| OC | Office of Communications | 通信办公室 |
| OC | Orlando Cabrera (baseball player) | 奥兰多·卡布雷拉（棒球运动员） |
| OC | Oregon City (Oregon) | 俄勒冈市（俄勒冈） |
| OC | Operation Class | 操作类别 |
| OC | Oakland City (Indiana College) | 奥克兰市（印第安纳学院） |
| OC | OpenCup (online tournament) | OpenCup（在线锦标赛） |
| OC | Opere Citato (Latin: In the Work Cited) | Opere引文（拉丁语：在引用的作品中） |
| OC | Officer Candidate | 预备军官 |
| OC | Officer of the Order of Canada | 获得加拿大勋章的军官 |
| OC | Outside Circumference | 外周长 |
| OC | Open Circuit (SCUBA and electronics) | 开路（SCUBA和电子设备） |
| OC | Ordnance Controller | 军械控制员 |
| OC | Operation Context | 操作上下文 |
| OC | Order of the Carmelites (religious order) | Carmelites教团（宗教教团） |
| OC | Oxnard College (Oxnard, CA) | 奥克斯纳德学院（加利福尼亚州奥克斯纳） |
| OC | Obstetric Cholestasis | 产科胆汁淤积症 |
| OC | Otaku Convention (Japanese film festival) | 御宅大会（日本电影节） |
| OC | Order of Canada | 加拿大令 |
| OC | Overture Center (performing arts) | 序曲中心（表演艺术） |
| OC | Organizadora de Comercio (Spanish; Guatemala) | Comercio组织（西班牙语；危地马拉） |
| OC | Oracle Clinical | Oracle临床 |
| OC | Ocean City | 海洋之城 |
| OC | Organic Carbon | 有机碳 |
| OC | OxyContin (prescription drug; aka Oxys) | OxyContin（处方药；又名Oxys） |
| OC | Organized Crime | 有组织犯罪 |
| OC | Outage Continuing | 停机持续 |
| OC | Oral Contraceptive | 口服避孕药 |
| OC | On Center | 在中心位置 |
| OC | One Communications, Inc. | One Communications公司。 |
| OC | Observer Controller | 观察员控制器 |
| OC | Organizational Committee of ACC | 行政协调会组织委员会 |
| OC | Other Character | 其他字符 |
| OC | Opposing Counsel (legal notation) | 反对律师（法律符号） |
| OC | Oliver Cromwell | 奥利弗·克伦威尔 |
| OC | optic chiasm | 视交叉 |
| OC | oral cholecystography | 口腔胆囊造影 |
| OC | Officer in Command | 指挥官 |
| OC | Out Cast (gaming clan) | 出局（游戏部落） |
| OC | Octopus Card (Hong Kong smart payment card) | 八达通卡（香港智能支付卡） |
| OC | Offering Circular | 发行通告 |
| OC | On Camera | 摄像头上 |
| OC | Over-Crossing | 交叉口上方 |
| OC | Oberlin College (Oberlin, Ohio) | 奥伯林学院（俄亥俄州奥伯林） |
| OC | Out Calls | 外出通话 |
| OC | Outdoors Center (Texas A&M) | 户外活动中心(往德克萨斯州农工) |
| OC | Open Canvas (art program) | 打开画布（艺术程序） |
| OC | Old Chinese (language of pre 400BC) | 古汉语（公元前400年以前的语言） |
| OC | Open Computing | 开放计算 |
| OC | Orange County (California; New York) | 奥兰治县（加利福尼亚州；纽约州） |
| OC | Office of the Commissioner | 专员办公室 |
| OC | Output Check | 输出检查 |
| OC | Oleoresin Capsicum (active ingredient in pepper spray) | 辣椒油树脂（胡椒喷雾中的活性成分） |
| OC | Ordinary Cadet | 普通学员 |
| OC | Off Camera (cinematography) | 离镜头（电影） |
| OC | Oak Cliff (Dallas neighborhood) | 橡树崖（达拉斯社区） |
| OC | Operating Characteristic | 操作特性 |
| OC | Online Community | 在线社区 |
| OC | Outside Contracting/Contractor | 外面承包/承包商 |
| OC | oxytocin | 催产素 |
| OC | Operating Committee | 运营委员会 |