GKO may refer to:

GKO (Russian: , Gosudarstvennoye Kratkosrochnoye Obyazatyelstvo), a Russian bond issued in the mid-1990s Ancient Greek language GKO construction, in conformal field theory Gunna Kalan railway station, in Pakistan Kok-Nar language State Defense Committee (Russian: , Gosudarstvennyj komitet oborony) of the USSR