St. Margaret's Bay Mariners were a Canadian Junior ice hockey team from Upper Tantallon, Nova Scotia.
The St. Margaret's Bay Mariners joined the Nova Scotia Junior Hockey League in 1989.
They won their final but lost the provincials to the Sydney Millionaires, the Mariners were allowed to attend the Cup as Nova Scotia representatives.
The Mariners would go on to win the entire thing, the last time the Atlantic crown would be contested in seven years.
In 2005, thirteen years later, the Bay Ducks would take the Mariners' place and win Upper Tantallon another Don Johnson Cup that very season.