Viscount Newcastle is a title in the British peerage, associated with the region of Newcastle upon Tyne. The title was first created in 1643 for William Cavendish, a prominent politician and military leader during the English Civil War. The title has been held by various members of the Cavendish family, who have played significant roles in British history. The Viscountcy is part of the Cavendish family lineage, which includes other notable titles such as the Duke of Devonshire. The current holder of the title is often involved in charitable activities and may participate in the House of Lords, contributing to legislative discussions and decisions.