Sir William Milner, 5th Baronet

Sir William Mordaunt Edward Milner, 5th Baronet (20 June 1820 – 12 February 1867) was a Whig politician.

Milner was first elected Whig MP for City of York at a by-election in 1848—caused by the death of Henry Galgacus Redhead Yorke—and held the seat until 1857, when he did not seek re-election. He also wrote a 'Nomenclature of British Birds'. The collection was loaned to the Leeds Philosophical and Literary Society in 1877 and purchased by the City of Leeds (now Leeds Museums and Galleries) in 1921. A large portion of it was destroyed on 15 March 1941 when a bomb landed on the City Museum, Park Row, Leeds.