The Double Tower is one of the 17 towers which were part of the city walls of Waterford, Munster, Ireland. It was built in the latter part of the 15th century and the early part of the 16th century. Six of the original 17 towers survive to this day; the other five being Reginald's Tower, Beach Tower, Semi-Lunar Tower, French Tower, and Watch Tower (Waterford). The Double Tower is located on Castle Street, between the French Tower and the Watch Tower. All three towers are well-preserved, along with some parts of the old city wall between them.