John D. H. Greenwood (1889–1975), English composer of classical and film music
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John Eric Greenwood (1891–1975), rugby union international who represented England
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On screen, Roger was portrayed by actor John Greenwood in the two-part BBC TV play Conquest (1966), part of the series Theatre 625.
John Greenwood drove Chevrolet Corvettes during several significant races in the 1970s, including the 24 Hours of Le Mans (1972, 1973, 1976), the 24 Hours of Daytona (1971), and the 12 Hours of Sebring (1971).