William Scamp (5 June 1801 – 13 January 1872) was an English architect and engineer. After working on the reconstruction of Windsor Castle to designs of Sir Jeffry Wyatville, he was employed by the Admiralty from 1838 to his retirement in 1867. Throughout his career of almost three decades, Scamp designed naval facilities in Britain, Malta, Gibraltar and Bermuda.

Scamp's early works from the 1840s include a dockyard and the Royal Naval Bakery in Malta. During his stay in Malta, he oversaw the construction of St Paul's Pro-Cathedral, making significant alterations to the building in the process. His most notable works in Britain were extensions of the Chatham and Portsmouth Dockyards carried out from the 1860s to the 1880s.

Scamp was born on 5 June 1801 in the village of Georgeham in North Devon, and he was the son of a maltster and shipowner. He was interested in geometry and surveying from a young age, and he taught himself since his father's death prevented him from having professional training. His breakthrough came when Jeffry Wyatville noticed his work in a competition entry for the Assembly Halls at Ilfracombe. Scamp subsequently worked with Wyatville, serving as a Clerk of Works during the reconstruction of Windsor Castle for over a decade.

In 1838, Scamp joined the Admiralty at Woolwich Dockyard. Between 1841 and 1844, he worked on three major projects in Malta: the No. 1 Dock in Cospicua, the Royal Naval Bakery in Birgu and St Paul's Pro-Cathedral in Valletta. Queen Adelaide, who had commissioned the cathedral, presented Scamp with a silver candelabrum as a gratitude for his work upon his return to England. During his stay in Malta, he had a daughter named Adelaide Frances Melita (born 1844) with his partner Harriet Wynder.

In 1845 Scamp was recalled from Malta to take up the position of Chief Assistant to the Director of Admiralty Works. He was subsequently involved in re-equipping naval bases around the British Empire in order to make them suitable for ironclads. By 1860, Scamp was credited with major works at the Admiralty establishments in the colonies of Malta, Gibraltar and Bermuda as well as naval bases in Britain itself, such as Deptford, Woolwich, Sheerness, Portsmouth and Pembroke. He became Deputy Director to G. T. Greene in 1852, which had a role in designing iron-framed structures for the Admiralty in the 1850s.

Scamp was married and had two sons, who predeceased him. He retired in 1867, but later designed a land reclamation project for Morecambe Bay and made plans for improving Lancaster Harbour. He died at the age of 70 on 13 January 1872 from lung congestion after a week-long illness. He was buried at Kensal Green Cemetery in London.

Scamp is credited with designing dockyard facilities in a logical manner, rather than locating buildings wherever space was available. His projects also considered the possibility of further expansion in the future.

Scamp arrived on Malta in 1841 along with Captain R. E. Brandreth, in order to draw up a report on Malta's dockyard facilities. This was to be a short visit, but Scamp ended up working on the island for three years. Scamp's stay in Malta had significant impact on the island's architectural scene, since he introduced a new form of British colonial architecture which challenged the existing Baroque-inspired traditions which originated from the Hospitaller era.