was a barrier island and location of a pleasure resort southwest of New Orleans on the Gulf Coast of Louisiana, United States.

Subsequent tropical storms did more damage, and Isle Dernière was further fragmented into smaller islands.

It was put into service on December 29, 1849, but was replaced in 1860 by a permanent lighthouse of the iron skeletal tower type.

Of the approximately 400 vacationers on the island at the time the hurricane hit it, 198 were known or presumed dead and 203 were known survivors.

Raccoon Island in particular is one of the most important waterbird nesting areas on the Louisiana Gulf Coast.