Store Koldewey is an island in northeastern Greenland. It is the largest of the Koldewey Islands. The island was visited by the Second German North Polar Expedition 1869–70, led by Carl Koldewey and referred to as grosse Koldewey Insel in the astronomy section of the expedition report, but this may not have intended as a formal name. The present island was shown on Koldewey’s maps as three islands.