Ajax (; 2021 population: 126,666) is a waterfront town in Durham Region in Southern Ontario, Canada, located in the eastern part of the Greater Toronto Area. The town is named for HMS Ajax, a Royal Navy cruiser that served in the Second World War. It is approximately 11 kilometres (7 mi) east of Toronto on the shores of Lake Ontario and is bordered by the City of Pickering to the west and north, and the Town of Whitby to the east.