Viscount Longueville was a title created twice, once in the Peerage of England and once in the Peerage of Ireland. On 21 April 1690, Henry Yelverton, 15th Baron Grey de Ruthyn was created Viscount Longueville in the Peerage of England. His son the second viscount, Talbot Yelverton, was created Earl of Sussex in 1717, with which title the viscountcy then merged, until both titles became extinct in 1799 on the death of the third Earl.

On 1 October 1795, Richard Longfield was created Baron Longueville, of Longueville in the County of Cork, and on 29 December 1800, he was created Viscount Longueville, of Longueville in the County of Cork. Both titles were in the Peerage of Ireland. Both titles became extinct on his death in 1811.

• Henry Yelverton, 1st Viscount Longueville (died 1704)
• Talbot Yelverton, 2nd Viscount Longueville (1690–1731) (created Earl of Sussex in 1717)

See Earl of Sussex

• Richard Longfield, 1st Viscount Longueville (1734–1811)

• Yelverton baronets of Easton Mauduit
• Baron Grey de Ruthyn

• Leigh Rayment's Peerage Pages ^{[self-published source] [better source needed]}