MV Princess of Acadia was a roll-on/roll-off passenger and motor vehicle ferry that traveled between Digby, Nova Scotia and Saint John, New Brunswick, crossing the Bay of Fundy.

In 1969 Canadian Pacific Limited subsidiary CP Ships sought to renew its Digby - Saint John passenger-only ferry service operated by SS Princess of Acadia.

The federal government subsidized construction of the new passenger and motor vehicle ferry Princess of Acadia at Saint John Shipbuilding & Dry Dock Co., Ltd. and built new ferry terminals at Digby and Saint John in exchange for a commitment from CP Ships to operate the service until such time as it was no longer profitable.

In 1997 the federal government removed itself from managing the vessel and operating and subsidizing the Digby - Saint John route.

In the mid-2000s, the rising operating costs and absence of a subsidy from the federal government began to raise the issue of whether the ferry was sustainable.