The castle was erected as a 12th-century manor house and fortified in 1377, giving it a rhomboid shaped stonework enclosure with high curtain walls, internal towers in each corner, a hall and a gateway. It was used as a fortress by the bishops of Chichester. The walls, gateway and two of the towers remain as a Grade I listed building and are now in use as a privately owned hotel. 
The site on which the castle stands belonged to the Bishops of Chichester. The first recorded structure was a timber-framed lodge built by Bishop Ralph de Luffa in 1103. This was knocked down in 1140 by Bishop Seffrid I and replaced by a more elaborate stone hall, to which Bishop Seffrid II added the East Wing in 1200. A larger Great Hall was added by Bishop John Langton between 1305 and 1337, when the site became known as the Bishop of Chichester’s Summer Palace. 
Bishop William Reade had the Great Hall knocked down and replaced by a better one and in 1377 applied for, and received, permission to fortify the site and add the gatehouse and oubliette. Walls up to 40 feet high were built round the whole site. Bishop Robert Sherborne, who died in 1536, was the last Bishop of Chichester to occupy the castle, after which it was leased by a number of tenants. 
In the English Civil War the Royalist tenant caused Oliver Cromwell to order General William Waller to attack the castle, which resulted in the loss of 20 feet from the height of the walls and the destruction of the Great Hall. The castle was sold to a Mr Butler but restored to the Bishop of Chichester after the Restoration of the Monarchy in 1660. The Butlers remained as tenants, followed by the Briscoes.
In 1872, the Castle was sold to Lord Zouche, who used it as a hunting lodge before selling it to Henry Fitzalan-Howard, 15th Duke of Norfolk in 1893. Known as ‘The Builder Duke’, the 15th Duke renovated the castle, as well as modernising Arundel Castle and building Arundel Cathedral. In 1926, the castle passed to the Emmett family, in 1982 to Hollis Baker, in 1987 to an American family and in 1988 to Joy and Martin Cummings, who converted it to a restaurant. From 2004 to 2011 it was owned by Relais & Châteaux.
Much modified, the castle is now (2014) owned by Andrew and Christina Brownsword and operated as an hotel in the Brownsword Hotel group.
- Historic England. "AMBERLEY CASTLE (1027499)". National Heritage List for England. Retrieved 12 November 2014.
- "Images of England: Amberley Castle". English Heritage. Retrieved 2007-11-29.
- "Amberley Castle". Retrieved 13 November 2014.
- "The History of Amberley Castle". Retrieved 13 November 2014.
- "Amberley Castle". Amberley Castle Hotel. Archived from the original on 30 November 2007. Retrieved 2007-11-29.
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