| OPT |
Open Protocol Technology |
| OPTA |
Onafhankelijke Post en Telecommunicatie Autoriteit (NL) |
| OPUS |
Overlay Peer Utility Service |
| OPUS |
Online Publikationsverbund der Universität Stuttgart |
| OPUS |
Octal Program Updating System |
| OPX |
Off Premises Extension |
| OQL |
Object Query Language |
| OQPSK |
Offset Quadrature Phase Shift Keying |
| OR |
Operations Research |
| ORACLE |
Optional Reception of Announcement by Coded Line Electronics |
| ORB |
Object Request Broker |
| ORBL |
Open Relay Black List |
| ORDB |
Open Relay Data Base |
| ORG |
organizational; Internet-Domain: Organisationen in den USA |
| ORNL |
Oak Ridge National Laboratory |
| OROM |
Optical Read Only Memory |
| ORP |
Open Router Project |
| ORS |
Output Record Separator |
| OS |
Operating System |
| OS |
Output Specification |
| OSA |
Open Scripting/Services/Solutions/Storage/Systems Architecture |
| OSA |
Optical Society of America |
| OSACA |
Open System Architecture for Controls within Automation Systems |
| OSAF |
Origin Subarea Address Field |
| OSC |
On Scene Commander |
| OSC |
Open System Center (IBM) |
| OSC |
Operating System Command |
| OSCAR |
Orbiting Satellite Carrying Amateur Radio |
| OSCI |
Online Services Computer Interface |
| OSD |
Open Source Definition |
| OSD |
On Screen Display |
| OSD |
Open Software Description (Format) |
| OSDL |
Open Source Development Lab, Oregon |
| OSE |
Open Systems/Software Environment |
| OSF |
Open Software Foundation |
| OSI |
Open Systems Interconnect/Interconnection (ISO) |
| OSIE |
Open Systems Interconnection Environment |
| OSINLCP |
OSI Network Layer Control Protocol |
| OSITOP |
Open Systems Interconnection Technical and Office Protocols |
| OSL |
Object Script Language |
| OSL |
Open Subscription License |
| OSM |
On Screen Menue |
| OSM |
Operating System Specific/Service Module |
| OSNR |
Optical Signal to Noise Ratio |
| OSO |
Overscan Operation |
| OSPF |
Open Shortest Path First (Internet) |
| OSPI |
Operating System Programming Interface |
| OSPM |
Operating System direct Power Management |
| OSQL |
Object Structured Query Language |
| OSS |
Object Storage Server |