Torre dell'Olio, Medieval defensive tower in Spoleto, Italy.

Torre dell'Olio is a rectangular tower with a base of 3.80 by 7.00 metres and walls 1.70 metres thick at the bottom, tapering to 1.00 metre at the top. It rises 45.50 metres, of which about 27 metres are embedded in Palazzo Vigili and 19 metres stand free. The lower 8 metres are faced with stone blocks; the upper part is rubble masonry bound with lime, mortar and river sand.

The tower is probably one of the "centum turres" recorded in Spoleto in the time of Barbarossa, who mentioned them in 1155. Its present appearance likely dates to the 13th century, and it belonged to the Grifonesca vaita. It was later incorporated into Palazzo Vigili, built in two phases around it.

The tower's name comes from a medieval defense method where hot oil was poured from above onto attackers below. This brutal tactic was common practice in fortified cities during times of conflict.

The tower is private property, divided among five or six owners, and cannot be visited inside. It is best seen from Via Porta Fuga, next to the Porta Fuga gate, where the base and the lower section embedded in Palazzo Vigili are visible. The upper 19 metres stand free above the palace roof.

The tower's base is built of stone blocks measuring 70 by 80 cm and rises about 8 metres, while the upper shaft is rubble masonry bound with lime, mortar and river sand. On the via Porta Fuga facade, small splayed openings just 20 by 20 cm wide served for ventilation and visual control of the street below.