The Faddey Bay (Залив Фаддея; Zaliv Faddeya) is a gulf in the Laptev Sea on the eastern coast of the Taymyr Peninsula. It measures about 47 km from its innermost point in the southwest, the delta of the Pregradnaya River, to its broadest opening to the sea in the northeast. Its average width is 21 km.
Owing to its extreme northerly location, the climate in the area of the Faddey Bay is exceptionally severe, with prolonged, bitter winters. This gulf is covered by ice most of the year, sometimes remaining frozen even in the brief summer period.
The Faddey Islands lie to the north of the bay, right off its mouth. Both islands and the strait were named by Boris Vilkitsky's 1913 expedition after Russian explorer Faddey Bellingshausen, the discoverer of Antarctica.
The Faddey Bay was visited by Vitus Bering during his exploratory expeditions of the Russian Great North and East.
- William Barr (Arctic historian), The First Soviet Convoy to the Mouth of the Lena.
- Exploration of the area:  and 
- History of the area: 
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