Colesbukta is a bay at the southern side of Isfjorden, in Nordenskiöld Land at Spitsbergen, Svalbard. The bay is about 4.5 kilometers wide. A railway for coal transport was earlier operated between Grumantbyen and shipment facilities in Colesbukta.[1][2] The valley Colesdalen debouches into Colesbukta.[3]
The cabin built by the Russian geologist Vladimir Rusanov in 1912 at the entrance to Colesbukta has been turned into a small self-guided museum. Other buildings and facilities in the old Soviet settlement remain abandoned.