OSINLCP - Open Systems Interconnection Network Layer Control Protocol
OSIS - Open Scriptural Information Standard
OSL - Open Subscription License
OSO - OverScan Operation
OSP - Online Service Provider
OSP - Open Settlements Protocol
OSPF - Open Shortest Path First
OSPM - Operating System-directed Power Management
OSR - OEM Service Release
OSR - Open Systems Resources
OSS - Open Sound System
OSS - Open Source Software
OSS - Operations Support System
OSS/FS - Open Source Software/Free Software
OSSAIN - Operator Services Signaling Advanced Intelligent Networking
OSSI - Open-Source Software Institute
OSSP - Open Source Software Project
OST - Object Storage Target
OST - Office Systems Technologies
OST - OnSite instructor-led Training
OSTA - Optical Storage Technology Association
OSTC - Open System Testing Consortium
OSWD - Open Source Web Design
OT - Object Technology
OT&E - Operational Test and Evaluation
OTFT - Organic Thin Film Transistor
OTG - On-The-Go
OTH - Optical Transport Hierarchy
OTM - Open Transaction Manager
OTM - Optical Transport Module
OTMA - Open Transaction Management Architecture
OTN - Optical Transport Network
OTN - Oracle® Technology Network
OTP - One-Time Password
OTP - One-Time Programmable
OTS - Object Transaction Service
OTS - Optical Transmission Section
OU - Organization Unit
OUCS - Oxford University Computing Services
OUCU - Open University Computer Username
OUI - Organizational Unique Identifier
OUM - Ovonic Unified Memory
OUSPG - Oulu University Secure Programming Group
OVF - Octal Voice Frequency
OVO - OpenView Operations
OVS - Open Video System
OWA - Outlook Web Access
OWASP - Open Web Application Security Project
OWB - Oracle9i Warehouse Builder
OWC - Office Web Components
OWL - Online Writing Lab
OWL - Web Ontology Language
OXC - Optical Cross-Connect