The title of Earl of Portsmouth was created in the Peerage of Great Britain in 1743.

The Earl holds the subsidiary titles of Viscount Lymington (1720) and Baron Wallop (1720), both in the Peerage of Great Britain.

The family seat is Farleigh House in Hampshire.

Earls of Portsmouth (1743)

• John Wallop, 1st Earl of Portsmouth (1690-1762)
• John Wallop, 2nd Earl of Portsmouth (1742-1797)
• John Charles Wallop, 3rd Earl of Portsmouth (1767-1853)
• Newton Fellowes, 4th Earl of Porstmouth (1772-1854)
• Isaac Newton Wallop, 5th Earl of Portsmouth (1825-1891)
• Newton Wallop, 6th Earl of Portsmouth (1856-1917)
• John Fellowes Wallop, 7th Earl of Portsmouth (1859-1925)
• Oliver Henry Wallop, 8th Earl of Portsmouth (1861-1943)
• Gerard Vernon Wallop, 9th Earl of Portsmouth (1898-1984)
• Quentin Gerard Carew Wallop, 10th Earl of Portsmouth (b. 1954)