Sir William Lemon, 1st Baronet (11 October 1748 – 11 December 1824) was a Member of Parliament for Cornish constituencies from 1770 to 1824, a total of 54 years.
He was the son of William Lemon and Anne, the daughter of John Willyams of Carnanton House and the grandson of William Lemon (1696–1760), who acquired the family estate at Carclew in 1749.
Lemon's younger brother John (1754–1814) became a Member of Parliament for Saltash and Truro and was the owner of Pollevillan. John Lemon died on 5 April 1814.
His sister Anne married John Buller MP for Exeter and West Looe.
He was educated at Christ Church, Oxford and with a Grand Tour.
He was Member of Parliament for Penryn 1770–1774 and Cornwall 1774–1824, a total of 54 years.
He was created Baronet Lemon of Carclew, Cornwall on 24 May 1774.
He married Jane, the eldest daughter of James Buller, MP for Cornwall and his wife Jane, who was eldest daughter of Allen Bathurst, 1st Earl Bathurst. Jane Lemon died 17 June 1823.
SOURCE: Debrett's Baronetage 1839.
He died on 11 December 1824 and was succeeded in his baronetcy by his son Charles Lemon (1784–1868).