Hamilton Township is a rural township located in Northumberland County in central Ontario. It surrounds the Town of Cobourg.
The township was named after Henry Hamilton, Lieutenant-Governor of Quebec from 1782 to 1785.
In the 2021 Census of Population conducted by Statistics Canada, Hamilton Township 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.
Mother tongue (2021):