Baron Londesborough, of Londesborough in the East Riding of the County of York, is a title in the Peerage of the United Kingdom. It was created in 1850 for the diplomat and Whig politician Lord Albert Denison. He was the third son of Henry Conyngham, 1st Marquess Conyngham, and his wife Elizabeth Denison. Born Albert Denison Conyngham, he assumed by Royal licence the surname of Denison in lieu of Conyngham in 1849 on inheriting the vast fortune of his maternal uncle William Joseph Denison (1770–1849). Before his elevation to the peerage, Denison had represented Canterbury in Parliament. His eldest son, the second Baron, sat as a Liberal Member of Parliament for Beverley and Scarborough. In 1887 he was created Viscount Raincliffe, of Raincliffe in the North Riding of the County of York, and