Warwick Castle (ⁱ/ˈwɒrɪk/ WORR-ik) is a medieval castle in Warwick, the county town of Warwickshire, England. It sits on a bend on the River Avon. The castle was built by William the Conqueror in 1068 within or adjacent to the Anglo-Saxon burh of Warwick. It was used as a fortification until the early 17th century, when Sir Fulke Greville converted it to a country house. It was owned by the Greville family, who became earls of Warwick in 1759, until 1978.

From 1088, the castle traditionally belonged to the Earl of Warwick, and it served as a symbol of his power. The castle was taken in 1153 by Henry of Anjou, later Henry II. It has been used to hold prisoners, including some from the Battle of Poitiers in the 14th century. Under the ownership of Richard Neville – also known as "Warwick the Kingmaker" – Warwick Castle was used in the 15th century to imprison the English king, Edward IV.

Since its construction in the 11th century, the castle has undergone structural changes with additions of towers and redesigned residential buildings. Originally a wooden motte-and-bailey, it was rebuilt in stone in the 12th century. During the Hundred Years War, the facade opposite the town was refortified, resulting in one of the most recognisable examples of 14th century military architecture.

Coordinates: 52°17′N 1°35′W / 52.28°N 1.59°W / 52.28; -1.59

Warwick (ⁱ/ˈwɒrɨk/ WORR-ik) is the county town of Warwickshire, England. The town lies upon the River Avon, 11 miles (18 km) south of Coventry and just west of Leamington Spa and Whitnash with which it is conjoined. As of the 2001 United Kingdom census, it had a population of 23,350.

There has been human activity at Warwick as early as the Neolithic, and constant habitation since the 6th century. A Saxon burh was created at Warwick in the 9th century and Warwick Castle was established on the site in 1068 as part of the Norman conquest of England. Warwick School claims to be the oldest boys' school in the country. The earldom of Warwick was created in 1088 and the earls controlled the town in the medieval period. During this time Warwick was given town walls; Eastgate and Westgate survive. The castle developed into a stone fortress and then a country house and is today a popular tourist attraction.

The Great Fire of Warwick in 1694 destroyed much of the medieval town and as a result most of the buildings post-date this period. Though Warwick did not become industrialised in the 19th century, it has experienced growth since 1801 when the population was 5,592. Racing Club Warwick F.C., founded in 1919, are based in the town. The town is administered by Warwick District Counil and Warwickshire County Council has its headquarters in Warwick.