| OCT | Octal | 八进制 |
| OCT | oxytocin challenge test | 催产素激惹试验 |
| OCT | Optically Compensated Twist-LC mode | 光学补偿液晶扭曲模式 |
| OCT | optical coherent tomography | 光学相干性断层摄像 |
| OCT | Order Cycle Time | 订单周期时间 |
| OCT | Office of Clinical Trials | 临床试验办公室 |
| OCT | Oral Contraceptive Therapy | 口服避孕药 |
| OCT | Oxford Classical Texts | 牛津经典课文 |
| OCT | Octave | 八度 |
| OCT | Optimal Control Theory | 最优控制理论 |
| OCT | Overseas Countries and Territories | 海外国家和领土 |
| OCT | Octamer-Binding Transcription Factor | 八聚体结合转录因子 |
| OCT | Official Conspiracy Theory | 官方阴谋论 |
| OCT | Optimal Cutting Temperature (compound for fixing specimens prior to cryosectioning) | 最佳切割温度（冷冻切片前固定试样的化合物） |
| OCT | Operational Climatic Testing | 作战气候试验 |
| OCT | Ocean Color and Temperature | 海洋颜色和温度 |
| OCT | Oils and Fats Chemistry and Technology | 油脂化学与技术 |
| OCT | Object Class Table | 对象类表 |
| OCT | Optical Coherence Tomography (medical imaging technique) | 光学相干断层扫描（医学成像技术） |
| OCT | optimal cutting temperature | 最佳切削温度 |
| OCT | object classification test | 物体分类试验 |
| OCT | Order Confirmation Transaction | 订单确认交易 |
| OCT | Optimized Cardioid Triangle | 优化心形三角形 |
| OCT | Ontario College of Teachers | 安大略省教师学会 |
| OCT | Octalizer Musical file | Octalizer音乐文件 |
| OCT | Oracle Command Type | Oracle命令类型 |
| OCT | Object Code Technology | 目标代码技术 |
| OCT | Optical Coherence Tomography | 光学相干层析成像 |
| OCT | OSHA Compliance Team | OSHA合规团队 |
| OCT | Office, Chief of Transportation | 办公室，运输部长 |
| OCT | Ontario College of Teachers (Canada) | 安大略教师学院（加拿大） |
| OCT | Optical Channel Trail | 光信道轨迹 |
| OCT | Officina CittÀ Torino (Italian) | Officina CittÀ Torino (Italian) |
| OCT | Ocular Coherence Tomography | 眼相干断层扫描 |
| OCT | Octamer Binding Transcription Factor | 八聚体结合转录因子 |
| OCT | Ottawa City Transportation (Canada) | 渥太华市交通（加拿大） |
| OCT | Optical Committee of Turkey | 土耳其光学委员会 |
| OCT | Operations Concept Team | 运营概念团队 |
| OCT | Oregon Cultural Trust | 俄勒冈文化信托 |
| OCT | Office of Cable Television | 有线电视办公室 |
| OCT | Ocala Civic Theatre | 奥卡拉市民剧院 |
| OCT | Obligation-Certification Tree | 义务认证树 |
| OCT | octanohydroxamic acid | 八氮异羟肟酸 |
| OCT | Optical Current Transducer | 光学电流传感器 |
| OCT | Organismo de Control TÉcnico (Spanish) | Organismo de Control TÉcnico (Spanish) |
| OCT | octane | 辛烷 |
| OCT | ornithine carbamoyltransferase | 鸟氨酸氨基转移酶 |
| OCT | oxytocin contraction test | 催产素收缩试验 |