The fortifications of Kingston upon Hull consisted of three major constructions: the brick built Hull town walls, first established in the early 14th century, with four main gates, several posterngates, and up to thirty towers at its maximum extent; Hull Castle, on the east bank of the River Hull, protecting Hull's river harbour, constructed in the mid 16th century and consisting of two blockhouses and a castle connected by a curtain wall; and the later 17th century Citadel, an irregular triangular, bastioned, primitive star fort replacing the castle on the east river bank.

The Charterhouse was a Carthusian monastery and almshouse in Kingston upon Hull, England, built just outside the town's walls. The hospital building survived the Dissolution of the Monasteries; the priory was destroyed in 1538. The structure of the hospital was destroyed before the first siege of Hull during the English Civil War. A replacement was built in 1645, which was replaced again in 1780; the buildings function as an almshouse with an attached chapel, and remain in use to the present day (2012).