The Torre delle Milizie ("Tower of the Militia") is a fortified tower in Rome, Italy, located between Trajan's Market in the Imperial fora to the southwest and the Pontifical University of Saint Thomas Aquinas, or Angelicum, to the east.

The actual construction of the tower probably dates to the time of Pope Innocent III (1198–1216) under the Aretino family.

Under the Caetani the fortified quarter was enlarged and strengthened, probably rivalling Castel Sant'Angelo as Rome's main fortress.

At the end of the 13th century when Henry VII of Luxembourg came to Rome for his coronation as Holy Roman Emperor (May–June 1312), he chose the Torre delle Milizie as the base for his Ghibelline supporters.

The Conti held the tower until 1619, when it was acquired by the nuns of the neighboring convent (later demolished) of Santa Caterina a Magnanapoli.