Mace Tower, Medieval defense tower at Buda Castle, Hungary

Mace Tower is a slender cylindrical tower with fully vertical walls of ashlar stone, standing at the corner of the southern closing wall of Buda Castle beside the Ferdinand Gate. Its "mace-head" top forms a small terrace with loopholes, covered by a wooden shingle roof. The tower body is medieval in origin, but the upper section was built entirely in the mid-20th century.

The tower's medieval core probably dates from the reign of Sigismund (1387–1437), later Holy Roman Emperor, and was likely given a thick stone casing when cannon spread. At the turn of the 19th and 20th centuries the old casing was replaced by a clinker-brick shell. In 1951 this shell was removed to reveal the thinner medieval tower, whose missing top was then rebuilt with the mace-shaped head.

The tower's present form results from post-war restoration choices: in 1951 the outer shell was removed to free the medieval core, and the top was later completed with a mace-head shape recalling old castles. The neighbouring rondella and wall were restored to medieval form, and Ferdinand Gate, reopened in the 1950s, now links the Tabán's Szarvas tér with the castle.

The tower is located at Szent György tér 2 and can be easily combined with other areas of the castle grounds when exploring the site. The surrounding area features multiple pathways and is accessible on foot.

The tower's present mace-head top is not medieval: after the war the restored medieval core was meant to stay truncated, but because the neighbouring rondella and wall were rebuilt in medieval form, the top was completed with a mace-head shape recalling old castles. The Ferdinand Gate beside it, dated 1838 by its inscription, was walled up in the late 19th century and reopened in the 1950s–60s.