Ludlow Castle is a ruined medieval fortification in the town of the same name in the English county of Shropshire, standing on a promontory overlooking the River Teme. The castle was probably founded by Walter de Lacy after the Norman conquest and was one of the first stone castles to be built in England. During the civil war of the 12th century the castle changed hands several times between the de Lacys and rival claimants, and was further fortified with a Great Tower and a large outer bailey. In the mid-13th century, Ludlow was passed on to Geoffrey de Geneville, who rebuilt part of the inner bailey, and the castle played a part in the Second Barons' War. Roger Mortimer acquired the castle in 1301, further extending the internal complex of buildings. Richard, Duke of York, inherited the castle in 1425, and it became an important symbol of Yorkist authority during the Wars of the Roses. When Richard's son, Edward IV, seized the throne in 1461 it passed into the ownership of the Crown. Ludlow Castle was chosen as the seat of the Council of Wales and the Marches, effectively acting as the capital of Wales, and it was extensively renovated throughout the 16th century. By the 17th century the castle was luxuriously appointed, hosting cultural events such as the first performance of John Milton's masque Comus. Ludlow Castle was held by the Royalists during the English Civil War of the 1640s, until it was besieged and taken by a Parliamentarian army in 1646. The contents of the castle were sold off and a garrison was retained there for much of the interregnum.

Ludlow is a market town and civil parish in Shropshire, England. It is located 28 miles (45 km) south of Shrewsbury and 23 miles (37 km) north of Hereford, on the A49 road which bypasses the town. The town is near the confluence of the rivers Corve and Teme.