科唐坦半岛（法语：Cotentin），法国西北岸半岛，位处下诺曼第大区芒什省，临英伦海峡。

The Cotentin Peninsula (French pronunciation: ​[kotɑ̃tɛ̃]), also known as the Cherbourg Peninsula, is a peninsula in Normandy that forms part of the northwest coast of France. It extends north-westward into the English Channel, towards Great Britain. To its west lie the Channel Islands and to the southwest lies the Brittany Peninsula.