L'Acadien II was a Canadian-registered fishing vessel that capsized and sank on March 29, 2008. The vessel was being towed by Canadian Coast Guard Ship (CCGS) Sir William Alexander off Cape Breton, Nova Scotia at the time of the incident. Two of the crew of six were rescued and four men died in the incident. Recovery efforts have not located the sunken trawler nor the missing crew member who is now presumed dead. Canadian authorities have launched independent investigations into the incident.