The following people were educated at Westminster School, and are sometimes listed with OW (Old Westminster) after their name (collectively, OWW):

• Robert Bruce Cotton (1570 – 1631), antiquarian
• Ben Jonson (1573 – 1637), poet and dramatist
• Charles Chauncy (1592 – 1672), President of Harvard 1654 – 72
• George Herbert (1593 – 1633), public orator and poet
• John Dryden (1631 – 1700), poet and playwright
• John Locke (1632 – 1704), philosopher
• Sir Christopher Wren (1632 – 1723), architect and scientist, co-founder of the Royal Society
• Robert Hooke (1635 – 1703), scientist
• George Jeffreys, 1st Baron Jeffreys (1648 – 1689), Lord Chief Justice of the Bloody Assize, Lord Chancellor, died a prisoner in the Tower
• Henry Purcell (1659 – 1695), composer
• Charles Montagu, 1st Earl of Halifax (1661 – 1715), creator of the Bank of England
• William King (1663 – 1712), poet
• John Carteret, 2nd Earl Granville (1690 – 1763), statesman and Cabinet Minister
• Thomas Pelham-Holles, 1st Duke of Newcastle (1693 – 1768), First Lord of the Treasury 1754 – 1756, Prime Minister
• Henry Pelham (1696 – 1754), First Lord of the Treasury and Chancellor of the Exchequer 1743 – 1754, Prime Minister
• Charles Wesley (1707 – 1788), Methodist preacher and writer of over 6,000 hymns
• James Waldegrave, 2nd Earl Waldegrave (1715 – 1763), First Lord of the Treasury, Prime Minister for five days in 1757
• Francis Lewis (1713 – 1803), signatory of the United States Declaration of Independence
• General Thomas Gage (1721 – 1787), C in C North America, Governor of Massachusetts 1774
• John Burgoyne (1723 – 1792), Lieutenant-General who surrendered British Army at Saratoga
• Richard Howe, 1st Earl Howe (1726 – 1799), Admiral of the Fleet
• Charles Watson-Wentworth, 2nd Marquess of Rockingham (1730 – 1782), Prime Minister
• Warren Hastings (1732 – 1818), Governor-General of Bengal
• Nevil Maskelyne (1732 – 1811), Astronomer Royal
• John Horne Tooke (1736 – 1812), politician and philologist
• Edward Gibbon, FRS (1737 – 1794), historian
• William Cavendish-Bentinck, 3rd Duke of Portland (1738 – 1809), Prime Minister
• Arthur Middleton (1742 – 1787), signatory of the United States Declaration of Independence
• Charles Cotesworth Pinckney (1746 – 1825), ADC to Washington 1777, defeated by Jefferson in 1804 in contest for Presidency
• Jeremy Bentham (1748 – 1832), lawyer, eccentric, and philosopher
• Thomas Pinckney (1750 – 1828), American ambassador to Great Britain
• Thomas Bruce, 7th Earl of Elgin (1766 – 1841), ambassador to Constantinople, bringer of the Elgin Marbles to Britain
• Henry William Paget, 1st Marquess of Anglesey (1768 – 1854), cavalry and horse artillery officer at Waterloo, where he lost a leg
• Robert Southey (1774 – 1843), Poet Laureate 1813
• Fitzroy Somerset, 1st Lord Raglan (1788 – 1855), lost his right arm at Waterloo, C in C in the Crimea
• Sir James Graham, 2nd Baronet (1792 – 1861), politician
• John Russell, 1st Earl Russell (1792 – 1878), Prime Minister
• John Nelson Darby (1800 – 1882), Irish clergyman
• Benjamin Hall (1802 – 1867), Commissioner of Works and Public Buildings responsible for, amongst others, the current Palace of Westminster
• Gilbert Abbott a Beckett (1811 – 1856), writer
• Charles Dodgson (1832 – 1898), author under the pen name "Lewis Carroll"
• George Henty (1832 – 1902), author of more than 80 popular books for boys
• William Knox D'Arcy (1849 – 1917), entrepreneur
• A. A. Milne (1882 – 1956), author and journalist
• Henry Tizard (1885 – 1959), scientist and inventor
• Sir Adrian Boult (1889 – 1984), conductor
• Oliver Lyttelton, 1st Viscount Chandos (1893 – 1972), Cabinet Minister during World War II, chaiman of National Theatre Board
• Sir John Gielgud (1904 – 2000), actor and director
• H. A. R. (Kim) Philby (b. 1912), journalist who defected to USSR 1963
• Angus Wilson (b. 1913), novelist
• Norman Parkinson (b. 1913), photographer
• Sir Andrew Huxley (b. 1917), scientist
• Sir Peter Ustinov (1921 – 2004), actor, writer and director
• Michael Flanders (1922 – 1975), entertainer and writer
• Donald Swann (1923 – 1994), entertainer and musician
• Richard Wollhein , (1923 – 2003), philosopher
• Tony Benn (b. 1925), politician
• Peter Brook (b. 1925), theatre director
• Nigel Lawson (b. 1932), politician
• Anthony Howard (b. 1934), journalist
• Roger Norrington (b. 1934), musician
• Peter Bottomley MP (b. 1944), politician
• Dan Topolski (b. 1945), rower
• Andrew Lloyd Webber (b. 1948), composer and producer
• John Brown (b. 1953), publisher
• Stephen Poliakoff (b. 1952), playwright
• Imogen Stubbs (b. 1961), actress
• Matt Frei (b. 1963), television journalist
• Gavin Rossdale (b. 1965), lead singer of the band Bush
• Helena Bonham Carter (b. 1966), model and actress
• Ruth Kelly MP (b. 1968), Secretary of State for Education and Skills
• Joe Cornish (b. 1968), comedian
• Adam Buxton (b. 1969), comedian
• Louis Theroux (b. 1970), television presenter
• Dido Armstrong (b. 1971), musician under the name "Dido"
• Oli Bennett (1972 – 2001), financial journalist, WTC attack victim
• Martha Lane Fox (b. 1973), e-commerce businessperson, lastminute.com founder
• Henry Winter , football correspondent of The Daily Telegraph
• Matthew Freud , MD of Freud PR

All persons listed are thought to be or have been British unless otherwise stated.

See also Category:Old Westminsters.