Shoal Tower, Military fortification in Kingston Harbour, Canada

Shoal Tower is a circular Martello tower of limestone standing in Kingston Harbour opposite City Hall. It measures 11 metres high and 16.5 metres in diameter, with thick walls built to resist artillery fire. The tower rises directly from the water on a stone base.

British engineers built the fortification between 1846 and 1847 during a period of rising tension with the United States. The structure was part of a larger security strategy to protect Canadian harbors from potential invasion.

The tower represents a specific British defensive strategy applied to Canadian waterways in the 1800s. This architectural approach shaped how the harbor was protected and shows the military priorities of the colonial period.

Shoal Tower sits in the Confederation Basin, the inner harbour facing Kingston City Hall, so it is seen from the waterfront path and from the City Hall square rather than entered. It is one of four Martello towers in Kingston; Murney Tower and the tower at Fort Frederick can be visited, which helps place Shoal Tower in the wider harbour defence line.

Shoal Tower was originally named Victoria Tower, and it is one of four Martello towers built in Kingston in the 1840s; the others are Cathcart Tower, Fort Frederick and Murney Tower. Of the 16 Martello towers built in Canada, 11 remain standing, and four of them are in Kingston.