| OCSI | One Call Systems International | 一呼系统国际 |
| OCSI | Open Collaboration Services Initiative | 开放协作服务倡议 |
| OCSI | Oxford and Cambridge Society of India | 印度牛津剑桥学会 |
| OCSI | Os Calcis Stiffness Index | Os钙化硬度指数 |
| OCSI | Oxford Consultants for Social Inclusion | 牛津社会包容顾问 |
| OCSI | Okinawa Christian School International (Okinawa, Japan) | 冲绳国际基督教学校（日本冲绳） |
| OCSI | On-Chip Spiral Inductor | 片上螺旋电感 |
| OCSI | Object-Oriented Client/Server Internet | 面向对象的客户机/服务器的网络 |
| OCSI | Olds College School of Innovation | Olds学院创新学院 |