EGS may refer to:
Education Enfield Grammar School, an English school Ermysted's Grammar School, an English school European Graduate School, a Swiss private university
Science Edinburgh Geological Society EGS (program), a Monte Carlo simulation program Ehlers–Geren–Sachs theorem Enhanced geothermal system European Geophysical Society, now part of the European Geosciences Union
Technology Emergency gas supply, a backup life support system for underwater diving Enhanced Graphics System, on the Amiga computer Epic Games Store, a digital video game storefront Ergis (company), a Polish chemical company Experimental Geodetic Satellite, a Japanese satellite Exploration Ground Systems, a NASA program
Other uses Ecological goods and services Egilsstaðir Airport in Iceland Expert Global Solutions, a defunct American debt collection agency