Sir Brook William Bridges, 3rd Baronet (17 September 1733 – 4 September 1791)^[1] was a British baronet and Whig politician.

Born at Whitehall, he was the only son of Sir Brook Bridges, 2nd Baronet and his wife Elizabeth Palmer, daughter and co-heiress of Sir Thomas Palmer, 4th Baronet, of Wingham (her sisters Anne Palmer and Mary Palmer both married into Finch family).^[2] Born after his father's death and being the eldest son, he was born into the title and property of the baronetcy of Goodnestone Park in Kent.^[2]

Bridges was educated at Eton College and Trinity College, Cambridge until 1752^[3] and began subsequently his Grand Tour.^[4] In 1763, he entered the British House of Commons for Kent, representing the constituency as Member of Parliament (MP) until 1774.^[5] He was for several years Receiver General of the land tax for Kent.^[6]

On 11 June 1765, he married Fanny Fowler, daughter of Edmund Fowler and heiress to the title Baron Fitzwalter, at St George's, Hanover Square in London.^{[citation needed]} They had six daughters and seven sons.^[6]

• Sophia (d. 1844), who married Col. William Deedes MP for Hythe. They had at least four sons.
• Harriet Mary, who married Rev. George Moore, son of the Most Rev. John Moore, Archbishop of Canterbury. They had one son, Edward, who later married Lady Harriet Montagu-Scott, daughter of Charles Montagu-Scott, 4th Duke of Buccleuch.
• Brook (14 Aug 1766 – 9 Jul 1781)
• Sir Brook William (22 Jun 1767 – 21 Apr 1829), who married firstly Eleanor Foote with whom he had three children including Brook Bridges, 1st Baron FitzWalter and Sir Brook William Bridges, 5th Baronet. He married secondly Dorothy Hawley, daughter of Sir Henry Hawley, 1st Baronet but without issue.
• Rev. Brook Henry (1 Jun 1769 – 20 Sep 1855), who married Jane Hales, daughter of Sir Thomas Hales, 4th Baronet. They had five children.
• Elizabeth (1773–1808), who married Edward Austen Knight, son of Rev. George Austen and older brother of Jane Austen (she visited them at Goodnestone regularly).^[7] They had eleven children.
• Rev. Brook Edward (1779-23 Apr 1825), who married Harriet Foote, sister to Eleanor. They had two sons. (This is the "Edward Bridges" mentioned in Jane Austen's letters^[8] and portrayed by Hugh Bonneville in Miss Austen Regrets.)^[9]

Bridges died, aged 57 in Portman Square in London^[10] and was buried in Goodnestone.^{[citation needed]} He was succeeded in the baronetcy by his second son William, who after the death of his older brother in 1781 had taken the additional Christian name Brook by licence of the archbishop.^[10]