Coffin Bay (34°37′S 135°28′E), originally Coffin's Bay, is a town at the southern extremity of the Eyre Peninsula, a wheat growing area of South Australia. At the 2006 census, Coffin Bay had a population of 584.
The town is situated on the western side of the southern tip of Eyre Peninsula about 46 km from Port Lincoln. The population swells during holiday seasons to more than 2,000 people due to its proximity to the Coffin Bay National Park.
It is a popular location for boating, sailing, swimming, water-skiing, skindiving and wind-surfing, as well as fishing (rock, surf, angling and boat).
Oyster farming is conducted in the quiet waters of Coffin Bay.
Coffin Bay is in the District Council of Lower Eyre Peninsula local government area, the state electoral district of Flinders and the federal Division of Grey.