Politics
- John Reid, Baron Reid of Cardowan (born 1947), former British Home Secretary and former Chairman of Celtic F.C.
- John William Reid (1821–1881), U.S. Representative from Missouri
- John Dowsley Reid (1859–1929), Canadian parliamentarian and Cabinet minister
- John C. W. Reid (1871–?), Canadian politician who served in the Legislative Assembly of Manitoba, 1910–1914
- John Mercer Reid (born 1937), Information Commissioner of Canada and a former member of the Canadian House of Commons
- Sir John Reid, 2nd Baronet (1791–1867), MP for Dover, 1830–1831 and 1832–1847
- John Flaws Reid (1860–1943), Scottish-born farmer and political figure in Saskatchewan, Canada
- John Reid (Australian politician) (1873–1963), member of the New South Wales Legislative Assembly
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