Sackville (45°54′N 64°22′W / 45.900°N 64.367°W, AST) is a town in Westmorland County, located in South-Eastern New Brunswick, Canada, only eight km from the Nova Scotia border and 45 km from the regional city of Moncton. In 2001 it had a population of 5,361 people, almost all English-speaking.
Sackville is the home of Mount Allison University, one of the most prestigious universities in Canada. The town is located on the western fringe of the Tantramar Marshes, tidal wetlands partially transformed to farmland by dykes first built by the original Acadians settlers of the region in the 17th century. The marshes remain one of the largest tidal wetlands in the world. In the centre of the town, an area of the wetlands has been developed and designated as the Sackville Waterfowl Park. The park has many walking trails and boardwalks for wildlife observation. Radio Canada International's short-wave transmitting station is located on the marshes just outside town.
Historically home to two foundries manufacturing stoves and furnaces, the economy is now driven by the university and tourism. Small-scale agriculture is carried out in the surrounding area, including dairy farming supported by haying on the marshes. The town is located on CN's Halifax-Montreal main railway line and is also on the Trans-Canada Highway connecting New Brunswick with Nova Scotia. The Greater Moncton International Airport (YQM) is located about 37 km north of town.
The town includes the amalgamated communities of Middle Sackville and Upper Sackville. It was originally part of the Colony of Nova Scotia's Sackville Township which was established following the Seven Years War in 1762–1763, alongside neighbouring Amherst Township and Cumberland Township. The name "Sackville" honours British military commander George Germain, 1st Viscount Sackville. The original town of Sackville was situated around several mills at Silver Lake in present-day Middle Sackville; the town's central business district moved to the present location after the Intercolonial Railway of Canada built the Truro-Moncton mainline south of town along the edge of the Tantramar Marshes.
The warship and Canada's living memorial to the Battle of the Atlantic, HMCS Sackville, is named after the town.