1920s
- Henry Chadwick (born 1920), Regius Professor of Divinity, University of Oxford, 1959–1969, Regius Professor of Divinity, University of Cambridge, 1969–1979, and Master of Peterhouse, Cambridge, 1987–1993
- John Edmondson, 2nd Baron Sandford (born 1920), politician and clergyman
- David Jamieson VC (1920–2001), Second World War Victoria Cross
- Sir John Jardine Paterson (1920–2000), Calcutta business man.
- John Maynard Smith (1920–2004), evolutionary biologist
- Peter Benenson (1921–2005), founder of Amnesty International
- Fiennes Cornwallis, 3rd Baron Cornwallis b. 1921
- Humphrey Lyttelton (1921–2008), jazz musician, band leader, composer, and chairman of BBC radio programme I'm Sorry I Haven't a Clue
- Hugo Charteris (1922–1970), author and screenwriter
- Michael Bentine (1922–1996), actor and comedian
- Adrian Liddell Hart (1922–1991), author and adventurer
- Patrick Macnee (born 1922), actor
- Edward Boyle, Baron Boyle of Handsworth (1923–1981), Financial Secretary to the Treasury, 1959–1962, and Vice-Chancellor, University of Leeds, 1970–1981
- Field Marshal Edwin Bramall, Baron Bramall (born 1923), Commander-in-Chief, United Kingdom Land Forces, 1976–1978, Vice Chief of the Defence Staff, 1978–1979, and Chief of the General Staff, 1979–1982
- James Chichester-Clark, Baron Moyola (1923–2002), Prime Minister of Northern Ireland, 1969–1971
- Michael Jaffé (1923–1997)
- George Lascelles, 7th Earl of Harewood (1923–2011), Managing Director, 1972–1985, and Chairman, 1986–1995, English National Opera, and President, British Board of Film Classification, 1985–1997
- Nicholas Mosley, 3rd Baron Ravensdale (born 1923), author
- Richard Ollard (born 1923), author, editor and historian
- Sir John Lindsay Eric Smith (born 1923), Director, Coutts and Co, 1950–1993
- HRH Prince Alexander of Yugoslavia (born 1924)
- Edward Thomas Hall (1924–2001), Scientist
- Robin Howard (1924–1989)
- Myles Ponsonby (1924–1999), intelligence officer, diplomat, British Ambassador to Mongolia
- John Bayley (born 1925), Warton Professor of English, University of Oxford, 1974–1992
- Sir William Gladstone, 7th Baronet (born 1925), Headmaster of Lancing College, 1961–1969, and Chief Scout of the United Kingdom, 1972–1982
- Robert Goff, Baron Goff of Chieveley (born 1926), Lord Justice of Appeal, 1982–1986, and Lord of Appeal in Ordinary, 1986–1998
- Robert Armstrong, Baron Armstrong of Ilminster (born 1927), Permanent Under-Secretary of State for the Home Department, 1977–1979, and Cabinet Secretary, 1979–1987
- John Coldstream (born 1927), Professor of Aegean Archaeology, King's College London, 1975–1983, and Yates Professor of Classical Art and Archaeology, University College London, 1983–1992
- Peter Dickinson (born 1927), author
- John Habgood, Baron Habgood (born 1927), Bishop of Durham, 1973–1983, and Archbishop of York, 1983–1995
- Robin Leigh-Pemberton, Baron Kingsdown (born 1927), Governor, Bank of England, 1983–1993
- Sir Reresby Sitwell, 7th Baronet (1927–2009)
- Major General Sir John Acland (born 1928), General Officer Commanding, South West District, 1978–1981
- John Barton (born 1928), Associate Director, Royal Shakespeare Company, 1964–1991
- Alan Clark (1928–1999) - Politician and diarist
- Sir Angus Ogilvy (1928–2004), husband of HRH Princess Alexandra
- Abdellatief Abouheif (born 1929), Egyptian swimming champion
- Sir Piers Bengough (born 1929), The Queen's Representative at Ascot, 1982–1997
- Sir Adrian Cadbury (born 1929), Managing Director, 1969–1974, and Chairman, 1975–1989, Cadbury Schweppes
- John Julius Cooper, 2nd Viscount Norwich (born 1929), writer, broadcaster and historian
- John Lawrence, 2nd Baron Oaksey (born 1929), horseracing commentator and journalist
- Anthony Lloyd, Baron Lloyd of Berwick (born 1929), Lord Justice of Appeal, 1984–1993, and Lord of Appeal in Ordinary, 1993–1999
- Sebastian Snow (1929–2001), explorer and writer
- Jeremy Thorpe (born 1929), Leader of the Liberal Party, 1967–1976
- Philip Ziegler (born 1929), author and historian
Read more about this topic: List Of Old Etonians Born In The 20th Century