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GEOS may refer to:
- GEOS (8-bit operating system), an operating system originally designed for the Commodore 64
- GEOS (16-bit operating system), a DOS-based graphical user interface and x86 operating system
- GEOS (securities processing software), an integrated online system for the management and processing of securities
- GEOS (software library), geometry engine open source
- GEOS (eikaiwa), an English conversation teaching company based in Japan
- GEOS circle, an intersection of four lines that are associated with a generalized triangle
- GEOS (satellite), a research satellite from ESRO (1978–1982)
- GEOS-3 (Geodynamics Experimental Ocean Satellite), a research satellite from NASA
- Groupe GEOS business consulting firm based in France
| disambiguation page lists articles associated with the title GEOS.
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