This article is about the tower in Marsaskala, Malta. There is another tower of the same name in the Tower of London.Saint Thomas Tower (Maltese: Torri ta' San Tumas), also known as Fort Saint Thomas (Maltese: Forti San Tumas), is a large bastioned watchtower in Marsaskala, Malta. It was built in 1614, the third of six Wignacourt towers. An artillery battery was added to the tower in the early 18th century.Saint Thomas Tower is the largest watchtower in Malta.