GIS Day is an annual event first held in November 19, 1999 by the National Geographic Society (NGS), the Association of American Geographers (AAG), and ESRI. Since then, GIS Day is held the third Wednesday of November each year during Geography Awareness Week. The name "GIS Day" is a trademark of ESRI. GIS is an abbreviation for Geographic Information Systems.
Principal sponsors of GIS Day include the following organizations:
- National Geographic Society
- Association of American Geographers (AAG)
- University Consortium for Geographic Information Science (UCGIS)
- United States Geological Survey
- Library of Congress
- Sun Microsystems