OCM
- Boolgeeda Airport
- Change Management
- Cloud Computing Manifesto
- Condition Monitoring
- European Space Agency
- IRS-P4
- LOC4951
- O'Callaghans Mills
- Occupy Central Movement
- Ohio Community Media
- Oil cleansing method
- Oil content meter
- Oka Chinna Maata
- Olympic Council of Malaysia
- One Caribbean Media
- Oracle Certification Program
- Oracle Corporation
- Ordo Sancti Constantini Magni
- Organisation civile et militaire
- Oriental Carpet Manufacturers
- Original component manufacturer
- Oxidative coupling of methane