St. Martins is a community on the Bay of Fundy now part of the village of Fundy-St. Martins, Canada.
The village was founded as Quaco by 1783 by soldiers from the disbanded loyalist King's Orange Rangers. It was incorporated in 1967. Led by shipbuilders such as James Moran, it was the third most productive shipbuilding town in the Maritimes, producing over 500 ships. Shipbuilding declined after the 1870s and today tourism is the major industry.
On 1 January 2023, province-wide local government reforms caused for the Village of St. Martins to annex all or part of Fairfield, Simonds, Upham, and Hampton local service districts, reforming the village boundaries under the new name Fundy-St. Martins. The former village's name remains in official use.
Attractions in St. Martins include the St. Martins Sea Caves, the beach and tidal harbour, the start of the Fundy Trail, two covered bridges and the Quaco Head Lighthouse, the Quaco Museum and Library, and the Fundy Trail Parkway.
In the 2021 Census of Population conducted by Statistics Canada, St. Martins had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.