William Baker (3 October 1743 – 20 January 1824) was a British politician.

William Baker was the eldest son of Sir William Baker, MP, educated at Eton College (1753–60). Admitted to Clare College, Cambridge in 1761, he did not matriculate there. He studied law at the Inner Temple (1761), where he was called to the bar in 1775.^[1] He succeeded his father in 1770, inheriting and renovating the Bayfordbury country house in Hertfordshire. He was elected a Sheriff of London for the same year.^[2]

Baker was the Member of Parliament for Aldborough 4 March 1777 – 8 September 1780,^[3] Hertford 7 September 1780 – 30 March 1784,^[4] Hertfordshire 23 June 1790 – 10 July 1802 and 11 February 1805 – 11 May 1807^[4] and Plympton Erle 22 March 1768 – 10 October 1774.^[5]

He died at the age of 80. He had married twice: firstly with Juliana, the daughter of Thomas Penn of Stoke Park, Buckinghamshire and the granddaughter of William Penn, Governor of Pennsylvania, with whom he had a daughter; and secondly with Sophia, the daughter of John Conyers of Copt Hall, Essex, with whom he had 9 sons and 6 daughters.

• historyofparliamentonline.org, Baker, William (1743-1824), of Bayfordbury, Herts.