William Garthshore FRSE (1764–1806) was an English politician, a Member of Parliament from 1795 to 1806.
In the same year he married Jane Chalié, daughter of a wealthy wine merchant.
for Launceston in January 1795, and for Weymouth in September of the same year, and retained his seat till his death.
His proposers were John Playfair, Alexander Monro (secundus) and William Wright.
[1] In 1801 he was appointed a Lord of the Admiralty by Henry Addington, which post he held till 1804; but the death of his father-in-law, his wife, and only child within a few days of one another (5 and 9 August 1803) caused a personal breakdown.