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 (1648-1689), Lord Chief Justice of the Bloody Assize, Lord Chancellor, died a prisoner in the Tower
• Henry Purcell (1659 - 1695), composer
• Charles Montagu, Earl of Halifax (1661 - 1715), creator of the Bank of England
• William King (1663 - 1712), poet
• John Carteret, 1st Earl Granville (1690 - 1763), statesman and Cabinet Minister
• Thomas Pelham-Holles, 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, 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
• Edward Gibbon, FRS (1737 - 1794), historian
• William Henry Cavendish-Bentinck, 3rd Duke of Portland (1738 - 1809), Prime Minister
• Arthur Middleton (1742 - 1787), signatory of the United States Declaration of Independence
• Charles 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 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 Robert George Graham (1792 - 1861), politician
• Lord 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 (born 1912), journalist who defected to USSR 1963
• Angus Wilson (born 1913), novelist
• Norman Parkinson (born 1913), photographer
• Sir Andrew Huxley (born 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
• Tony Benn (born 1925), politician
• Peter Brook (born 1925), theatre director
• Nigel Lawson (born 1932), politician
• Anthony Howard (born 1934), journalist
• Roger Norrington (born 1934), musician
• Peter Bottomley MP (born 1944), politician
• Dan Topolski (born 1945), rower
• Andrew Lloyd Webber (born 1948), composer and producer
• John Brown (born 1953), publisher
• Stephen Poliakoff (born 1952), playwright
• Imogen Stubbs (born 1961), actress
• Matt Frei (born 1963), television journalist
• Gavin Rossdale (born 1965), lead singer of the band Bush
• Helena Bonham Carter (born 1966), model and actress
• Ruth Kelly MP (born 1968), Treasury minister
• Joe Cornish (born 1968), comedian
• Adam Buxton (born 1969), comedian
• Louis Theroux (born 1970), television presenter
• Dido Armstrong (born 1971), musician under the name "Dido"
• Oli Bennett (1972 - 2001), financial journalist, WTC attack victim
• Martha Lane Fox (born 1973), e-commerce businessperson, lastminute.com founder

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