| OSG | Object Systems Group 
| Others |
| OSG | Objectivism Study Group
| Others |
| OSG | odontostomatognathic
| Others |
| OSG | Office of State Guardian
| Others |
| OSG | Office of Surgeon General
| Others |
| OSG | Office of the Solicitor General
| Others |
| OSG | Office of the Surgeon General
| Others |
| OSG | Officer Support Group
| Others |
| OSG | Ohio Sea Grant
| Others |
| OSG | On Site Generation
| Others |
| OSG | One Scotland Gazetteer
| Others |
| OSG | One Script Game
| Others |
| OSG | One Sexy Graphic
| Others |
| OSG | One Sheet Glider
| Others |
| OSG | One Sweet Guy
| Others |
| OSG | One Sword Guy
| Others |
| OSG | Online Strategy Guide
| Others |
| OSG | Online Support Group
| Others |
| OSG | Open Scene Graph
| Others |
| OSG | Open Science Grid
| Others |
| OSG | Open Service Gateway
| Others |
| OSG | Open Services Gateway
| Others |
| OSG | Open Source Government
| Others |
| OSG | Open System Group
| Others |
| OSG | Open Systems Group
| Others |
| OSG | Operational Security Guidelines
| Others |
| OSG | Operational Studies Group
| Others |
| OSG | Operational Support Group
| Others |
| OSG | Operations Support Group
| Others |
| OSG | Opsec Security Group
| Others |
| OSG | Optical Systems Group
| Others |
| OSG | Optimal Strategix Group
| Others |
| OSG | Oracle Spatial and Graph
| Others |
| OSG | Oran Safety Glass
| Others |
| OSG | Organic Sales Growth
| Others |
| OSG | Oromia Support Group
| Others |
| OSG | Orthopaedic Specialty Group
| Others |
| OSG | Ossima, Papua New Guinea
| Others |
| OSG | Otter Specialist Group
| Others |
| OSG | Outdoor Strategic Games
| Others |
| OSG | Outsourcing Services Group
| Others |
| OSG | Overseas Shipholding Group
| Others |