Mġarr ix-Xini Tower (Maltese: Torri ta' Mġarr ix-Xini) is the largest of the coastal watchtowers that the Knights of Malta erected on the island of Gozo.

It watches over the entrance to the bay of Mġarr ix-Xini, limits of Għajnsielem, which lies on Gozo's south-west coast.

Mġarr ix-Xini Tower was completed by June 1661, to a plan by Mederico Blondel.

The design is similar to the De Redin towers on mainland Malta, having a square plan with two floors.

However, the design differed since its entrance was approached by a flight of steps and a drawbridge, unlike the other towers which had a retractable ladder.