Breck Marshall is sailboat museum ship of the Mystic Seaport Museum in Mystic, Connecticut.

The Mystic Seaport Museum built Breck Marshall as reproduction of a Cape Cod catboat in 1987.

The Breck Marshall is 20 ft (6.1 m) long and is typical of boats built around 1900.

Catboats were used for fishing and for pleasure trips.

The Breck Marshall sails the upper Mystic River in warm months.