| Acronym | Definition |
|---|
| GSO | Gothenburg Symphony Orchestra (Gothenburg, Sweden) |
| GSO | Gaziantep Sanayi Odasi (Turkish: Gaziantep Chamber of Industry; Gaziantep, Turkey) |
| GSO | GBS (Graduate Business School) Student Organization |
| GSO | Gensko Spremenjeni Organizmi (Slovenian: Genetically Modified Organisms) |
| GSO | Graduate Studies Office (various locations) |
| GSO | Generative Shape Optimizer |
| GSO | Global Sign on |
| GSO | Generic Segmentation Offload |
| GSO | General Service Office |
| GSO | General Statistics Office (Vietnam) |
| GSO | Geostationary Orbit |
| GSO | Guangzhou Symphony Orchestra (China) |
| GSO | Geosynchronous Orbit |
| GSO | Geostationary Satellite Orbit |
| GSO | General Staff Officer |
| GSO | General Services Officer |
| GSO | Girl's Service Organization (USO) |
| GSO | Gelders Stedelijk Ontwikkelingsbeleid (Dutch: Gelders Urban Development) |
| GSO | Gunma Symphony Orchestra (Japan) |
| GSO | Global Software Outsourcing |
| GSO | Guitar Shaped Object |
| GSO | Global Sales Office |
| GSO | General Specifications for Overhaul of Surface Ships |
| GSO | Ground Safety Officer |
| GSO | Guernsey Symphony Orchestra (Guernsey, Channel Islands, UK) |
| GSO | GCC (Gulf Cooperation Council) Standardization Organization (Saudi Arabia) |
| GSO | Gadolinium Silicate |
| GSO | Gamer Symphony Orchestra (University of Maryland; College Park, MD) |
| GSO | Geographical Standards Organisation (fictional cartography) |
| GSO | Granite State Opera (New Hampshire, USA) |
| GSO | Ground Staff Office (Japan) |
| GSO | Genesee Symphony Orchestra (Batavia, NY) |
| GSO | General Spin Orbital |
| GSO | Gas Shut Off |
| GSO | Ground Systems and Operations |
| GSO | Goods and Services on Order |
| GSO | Gwinnett Symphony Orchestra (Georgia) |
| GSO | Gateway to Standards Organizations |
| GSO | Golden Sun Odyssey (message board) |
| GSO | Got Shipped Out |
| GSO | GCCS Security Officer |
| GSO | Ground Safety Office |
| GSO | Gloucestershire Symphony Orchestra (UK) |
| GSO | Gossudarstwennaja Sluzhba Ochrany (Russian: National Protection Service) |
| GSO | Graham-Schmidt Orthonormalization |
| GSO | Greensboro / High Point, NC, USA - Piedmont Triad International Airport (Airport Code) |
| GSO | Get Stuff On (polite form) |
| GSO | Glawnoje Sluzhba Ochrany (Russian: Main Protection Service) |