John Peter Michael Scawen Lytton, 5th Earl of Lytton (born 7 June 1950), styled Viscount Knebworth from 1951 to 1985, is a British chartered surveyor, hereditary peer and member of the House of Lords.

The elder son of Noel Lytton, 4th Earl of Lytton, by his wife Clarissa Mary née Palmer,[1] he is a descendant of the poet and adventurer Lord Byron (born 1788) via his daughter Ada Lovelace (born 1815), who was arguably the world's first computer programmer.

After spending thirteen years at the Inland Revenue Valuation Office and some additional years with surveying firms Permutt Brown & Co. and Cubitt & West, he set up the practice of John Lytton & Co., Chartered Surveyors, in January 1988.

FBEng in 1997, Lord Lytton is a Patron of the Chartered Association of Building Engineers.

[9] His cousins on the Cobbold side maintain the ancestral estate, Knebworth House, in Hertfordshire.