Gydan

Gydan may refer to:


 * Gydan Peninsula, a peninsula in the Kara Sea
 * Gydan Bay, a bay in the Kara Sea
 * Gydan Nature Reserve, the northernmost nature reserve in Western Siberia
 * Gydan Mountains, an obsolete name for the Kolyma Mountains
 * Yamal-Gydan tundra, an ecoregion in Northern Siberia