Others
- John Ferguson (artist), heraldic artist and illustrator
- John Ferguson (Ferguson bequest) (1787–1856), Scottish businessman and philanthropist. He was the founder of the Ferguson bequest
- John Ferguson (clergyman) (1852–1925), New Zealand born Australian Presbyterian minister
- John Ferguson (organist) (born 1941), American organist, composer, and professor
- Sir John Ferguson (police officer) (1891–1975), English chief constable
- John Ferguson (musician) (born 1978), American composer and performer, and member of The Apples in Stereo
- John Ferguson (priest) (died 1902), Anglican Dean of Moray, Ross and Caithness
- John Ferguson (Canadian politician) (1840–1908), Scottish-born farmer, lumberman and political figure in Ontario, Canada.
- John Howard Ferguson (1838–1915), judge in Louisiana
- John Ferguson (born 1943), real name of gambling author and Blackjack Hall of Famer Stanford Wong
- John H. Ferguson, defendant in the landmark American judicial case Plessy v. Ferguson
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