GEOS

GEOS may refer to:

Computer software
  • 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 (software), an integrated online system for the management and processing of securities
  • GEOS (software library), a free software topology library
Other
  • 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-1, 2 (Geodetic Earth Orbiting Satellite), research satellites from NASA
  • GEOS-3 (Geodynamics Experimental Ocean Satellite), a research satellite from NASA
  • GEOS-1 (Goddard Earth Observing System version 1), Earth model from NASA EOS Program