OCS
OCS typically denotes an Officer Candidate School, the training program for future military officers, while the same letters can also refer to technical systems or psychological terms in other fields.
Medical
Miscellaneous
Ontario Construction Secretariat
of the Chief Scientist
Office of Child Support
Olori Construction Services
Office of Coast Survey
Orinoka Crash
Office Coffee Service
Officer Candidate
Organic Content Standard
Online Customer Support
Office Communications Server
Operational Combat Series
Occupational Course of Study
Community
Only Christ Saves
Officer Candidates School
Ouachita Christian Schools
Onondaga Central Schools
Oklahoma Christian School
Oakland Christian School
Governmental
Officer Candidate School
Office of Community Services
Operation Clean Sweep
Optical Control System
Officer Commanding Police Station
Office of the Chief of Staff
Academic & Science
Office of the Chief Scientist
Optical Calibration Sphere
Open Control System
Optical Convergence Switch
Only Child Syndrome
On Campus Session
On-Chip Spectroscopy
Outer Continental Shelf
Office of Career Services
Ocean Climate Stations
Computing
Operator Communications Software
Output Control Software
On-line Charging System
Office Communication System
OEM Computing Solution
Office of Cyber Security
Internet
Business
Overnight Courier Service
One Complete Solution
Orthopaedic Certified Specialist
Occupancy Control System
Overnight Comparison System
Overseas Courier Service
OCP Credit Strategy Fund