Earl of Guilford is a title in the Peerage of Great Britain created in 1752.

The Earl holds the subsidiary title of Baron Guilford, of Guilford in the County of Surrey (1683), in the Peerage of England. The heir-apparent to the earldom uses the invented courtesy title of Lord North.

An unqualified reference to Lord North almost always refers to Frederick North, Lord North, later 2nd Earl of Guilford, who was Prime Minister of Great Britain from 1770-1782.

The town in Surrey from which both titles derive is now spelt Guildford.

Barons Guilford (1683)

• Francis North, 1st Baron Guilford (1637-1685)
• Francis North, 2nd Baron Guilford (1673-1729)
• Francis North, 3rd Baron Guilford (1704-1790) (became Earl of Guilford in 1752)

Earls of Guilford (1752)

• Francis North, 1st Earl of Guilford (1704-1790)
• Frederick North, 2nd Earl of Guilford (1732-1792)
• George Augustus North, 3rd Earl of Guilford (1757-1802)
• Francis North, 4th Earl of Guilford (1761-1817)
• Frederick North, 5th Earl of Guilford (1766-1827)
• Francis North, 6th Earl of Guilford (1772-1861)
• Dudley Francis North, 7th Earl of Guilford (1851-1885)
• Frederick George North, 8th Earl of Guilford (1876-1949)
• Edward Francis North, 9th Earl of Guilford (1933-1999)
• Piers Edward Brownlow North, 10th Earl of Guilford (b. 1971)