- Object-Oriented Programming
- Occupational Information Network
- Open and Closed Systems
- Operant Conditioning
- Operating Systems
- Operations Management
- Operations Scheduling
- Operations Strategy
- Opportunity Cost
- Order-Winning and Order-Qualifying Criteria
- Organic Organizations
- Organization Theory
- Organizational Analysis and Planning
- Organizational Behavior
- Organizational Chart
- Organizational Culture
- Organizational Development
- Organizational Learning
- Organizational Structure
- Organizing
- Outsourcing and Offshoring
