Qalet Marku Redoubt (Maltese: Ridott ta' Qalet Marku) was a redoubt in the limits of Naxxar, Malta.

It was built in 1715–1716 by the Order of Saint John as one of a series of coastal fortifications around the Maltese Islands.

[3] The redoubt originally consisted of a pentagonal platform with a low parapet.

[3] The redoubt was demolished to make way for the Baħar iċ-Ċagħaq–Salina coast road.

Part of the structure can still be seen protruding from beneath the road, although it is encased in concrete.