The Frankish Tower was a medieval tower built on the Acropolis of Athens by the Franks as part of the palace of the Dukes of Athens. It was demolished by the Greek authorities in 1874, on the initiative and with funding from Heinrich Schliemann.

The tower was situated on the western corner of the Acropolis, next to the Propylaea, but probably did not communicate directly with them, as paintings and photographs from the 19th century show the entrance above ground, on the tower's eastern face at the second-floor level, some 6 metres (20 ft) above the architrave of the Propylaea. Literary sources attest to the fact that the door was accessible by means of an external wooden staircase. On the other hand, a couple of photographs also show a ground entrance on the western side, which means that the lower portion of the tower was probably separate from the upper, and used as a prison or storage room.