GKO (disambiguation)

GKO may mean:

* GKO, State Short-term Bonds issued by the state of Russia in the mid-1990s ("Gosudarstvennoe Kratkosrochnoe Obyazatelstvo")
* Ancient Greek language (SIL code)
* Guard Knowledge Online, the U.S. National Guard Internet portal
* State Defense Committee presided by Joseph Stalin during WWII ("Gosudarstvenny Komitet Oborony")