Douarnenez, (Breton:douar (land) an enez (the island) or land of the island), is a commune in the Finistère department of Brittany in north-western France.

It is located at the mouth of the Pouldavid River, an estuary on the southern shore of Douarnenez Bay in the Atlantic Ocean, 25 kilometres (16 mi) north-west of Quimper. The population in 2008 was 15,066. It has declined since the mid-20th century because of jobs lost from declines in the fishing industry. But it still has fish canning facilities (sardines and mackerel) although sardine fishing, for which the town became famous, has fallen off in recent years.