Sir William Lewis Salusbury-Trelawny, 8th Baronet (4 July 1781-15 November 1856), was a British politician.

Born William Trelawny, he assumed in 1802 the additional surname of Salusbury.

He served as High Sheriff of Cornwall

High Sheriff of Cornwall

High Sheriffs of Cornwall: a chronological list:Note: The right to choose High Sheriffs each year is vested in the Duchy of Cornwall, rather than the Privy Council, chaired by the Sovereign, which chooses the Sheriffs of all other English counties, other than those in the Duchy of...

 in 1811 and later sat as Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 for Cornwall East

East Cornwall (UK Parliament constituency)

East Cornwall was a county constituency in the House of Commons of the Parliament of the United Kingdom. It elected two Members of Parliament by the bloc vote system of election.- Boundaries :...

 from 1832 to 1837. He served as Lord-Lieutenant of Cornwall from 1839 to 1856.

Salusbury-Trelawny died in November 1856, aged 69. He had married in 1807 Patience Christian Carpenter; they had several children. He was succeeded by his second son John

Sir John Salusbury-Trelawny, 9th Baronet

Sir John Salusbury Salusbury-Trelawny, 9th Baronet , was a British Liberal politician.Salusbury-Trelawny sat as Member of Parliament for Tavistock between 1843 and 1852 and 1857 and 1865 and for Cornwall East between 1868 and 1874....

as his eldest son Owen had died at a young age in 1830.