Nassagaweya Township is a geographic township^[1] and former municipality now part of Milton.

The township was created in 1819, its name derived from the Mississauga word nazhesahgewayyong, meaning 'river with two outlets.' This refers to the fact that watercourses in the township drain to both Lake Ontario and the Grand River system.

Nassagaweya township became part of the Town of Milton in 1974.

Communities within the boundaries of the former township include: Campbellville, Brookville, Moffat, Haltonville, Darbyville, Guelph Junction and Sayers Mills. Nassagaweya historically contained Eden Mills and borders on Kilbride.

The heritage house Nassagaweya in Brisbane, Australia was named after the township being the birthplace of the house's owner John Gillies.^[2]

By 1862, there were six schools in the township:^[3]

• In Concession 3, at lots 4, 10, 15 and 29
• In Concession 4, at lot 22
• In Concession 7, at lot 25

• Halton County Radial Railway
• Mohawk Raceway
• Mountsberg Conservation Area
• Crawford Lake Conservation Area
• Hilton Falls Conservation Area

• List of townships in Ontario