Optical Character Recognition 
Office of Civil Rights 
Office for Civil Rights 
Optical Character Reader 
Ordinary Capital Resources 
Office of Collateral Responsibility 
Office of Congressional Relations 
Operations Change Request 
Office of Community Relations 
Official cash rate 
Oil Circuit Recloser 
operational change report 
Operational Control Room 
Operations Control Room 
Optical Character Reading 
Outgoing Call Restriction 
Occur 
Occurrence 
ocular counterroll 
Ocular counterrolling 
oculocardiac reflex 
oculocephalic reflex 
Office of Coal Research 
Office of Co-Responsibility 
Office of Corporate Relations 
OFFICE OF CRASHWORTHINESS RESEARCH 
Oil Control Ring 
Oklahoma Central Railroad 
Oklahoma Central Railroad Company 
Omnicare, Inc.