Obfuscation
Object code
Object management group [OMG]
Object orientation
Objective
Objectivity
Object-oriented system development
Offline files

Offsite storage
Online data processing
Open Source Security Testing Methodology
Open system
Open Systems Interconnect (OSI) model
Open Web Application Security Project [OWASP]
Operating system [OS]
Operating system audit trail
Operational audit
Operational control

Operational level agreement [OLA]
Operator console
Optical character recognition [OCR]
Optical scanner
Organization
"Organization for Economic Cooperation and
Development" [OECD]
Organizational structure
Outcome
Outcome measure
Output analyzer

Outsourcing
Owner