OSG

OSG may refer to:

• Office of the Solicitor General of the Philippines
• Office of the Solicitor General of the United States
• Office of the Surgeon General of the United States
• Oklahoma State Guard, active during World War II
• On-site generation of electrical power
• One Scotland Gazetteer, the definitive national land, property and address dataset for Scotland
• Open Science Grid, a worldwide collection of technological resources
• OpenSceneGraph, a 3D graphics programming interface
• Operational Studies Group, a publisher of wargames related primarily to the Napoleonic Wars
• Overseas Shipholding Group