The Geological Survey of Denmark and Greenland (Danish: Danmarks og Grønlands Geologiske Undersøgelse, GEUS) is the independent sector research institute under the Danish Ministry of Climate and Energy.

GEUS is an advisory, research and survey institute in hydrogeology, geophysics, geochemistry, stratigraphy, glaciology, ore geology, marine geology, mineralogy, climatology, environmental history, air photo interpretation, geothermal energy fields concerning Denmark and Greenland.

It publishes a service paper called Greenland Hydrocarbon Exploration Information Service (GHEXIS) and a newsletter called Greenland Mineral Exploration Newsletter (MINEX) in co-operation with the Bureau of Minerals and Petroleum (Råstofdirektoratet), a secretariat for the Joint Committee on Mineral Resources under Greenland's home rule.

864 merged GGU into DGU, changing its name to DGGU (Danmarks og Grønlands Geologiske Undersøgelse).

1076 concerning Danish sector research institutes created GEUS by merging DGU and GGU.