Sir William Trelawny, 6th Baronet

Sir William Trelawny Bt
Arms of Trelawny: Argent, a chevron sable
Born	c.1722
Died	11 December 1772
Allegiance	Great Britain
Service/branch	Royal Navy
Years of service	c.1743–1772
Rank	Captain
Commands held	HMS Peregrine HMS Port Mahon HMS Vestal HMS Lion HMS Winchester HMS St Florentine
Battles/wars	War of the Austrian Succession Battle of Toulon Seven Years' War Invasion of Martinique Invasion of Guadeloupe

Sir William Trelawny, 6th Baronet (c. 1722 – 11 December 1772), of Trelawne, Cornwall was a British politician and colonial administrator.

He was the son of Captain William Trelawny, R.N. and educated at Westminster School. He succeeded his uncle Sir Harry Trelawny, 5th Baronet to the baronetcy in 1762, inheriting the Trelawne estate.

Trelawny sat as Member of Parliament for West Looe from 1757 to 1767. The latter year he was appointed Governor of Jamaica, a post he held until his death in December 1772. Trelawny Parish, Jamaica was named after him.

He died in Jamaica in 1772. He had married his cousin Laetitia, the daughter and heiress of Sir Harry Trelawny, 5th Baronet, with whom he had a son and a daughter.