Shoal Tower is a Martello tower located in the harbour (Confederation Basin) of Kingston, Ontario, Canada, directly opposite Kingston City Hall. It is one of four such towers built in the 1840s to protect Kingston's harbour and the entrance to the Rideau Canal. Cathcart Tower on Cedar Island, Shoal Tower in the Confederation Basin, Fort Frederick on the grounds of the Royal Military College of Canada, and Murney Tower were part of the same strategic improvements.