William Ridley-Colborne (24 July 1814 - 28 March 1846) was a British politician, who represented Richmond from 1841 until his death in 1846.
His grandfathers, Sir Matthew White Ridley, 2nd Baronet, and Thomas Steele, were both also Members of Parliament.
In the 1841 general election he was elected as a Whig for Richmond,[1] There had been some local opposition to his nomination, and a rumour that the seat was being held open by its patron as a safe seat for Lord John Russell should he be defeated in London,[2] but in the event he was returned along with John Dundas, a fellow Whig, in an unopposed election.
[3] Other than a by-election to fill a vacancy in 1839, the seat had not been contested for over a century, and was dominated by the Dundas family.
[1] He died in office after a sudden illness at the age of 31, on 28 March 1846.