John Day, John Daye or Jon Day may refer to:
Contents
People
Politicians
John Day (Nova Scotia legislator) (died 1775), merchant and politician in Nova Scotia
John Day Jr. (died 1792), soldier and political figure in Nova Scotia
John Day (Liberian judge) (1797–1859), Liberian politician and judge
John Charles Day (1826–1908), English judge
John Adam Day (1901–1966), politician in Devon, England
John Day (Indiana politician) (born 1937), Democratic member of the Indiana House of Representatives
John Day (Australian politician) (born 1955), Western Australian politician
John Day, Transport Workers Union of America Local 100 Vice President
Sportspeople
John Barham Day (1793–1860), English jockey and trainer
John Day (cricketer, born 1812), English cricketer
John Day (horseman) (1819–1883), English jockey and trainer
John B. Day (1847–1925), manager of the New York Giants in 1899
John Day (jockey) (1856–1885) Australian champion pedestrian and 1870 Melbourne Cup winner
John Day (cricketer, born 1881) (1881–1949), English cricketer
Other people
John Day (merchant) (fl. 1497–98), English merchant, author of a letter referring to existence of lost book Inventio Fortunata
John Day (printer) (c. 1522–1584), English Protestant printer, also known as John Daye
John Day (dramatist) (1574–c. 1638), English dramatist
John Day (carpenter) (c. 1740–1774), first recorded death in a submarine
John Day (trapper) (c. 1770–1820), American hunter and trapper
John Day (architect) (fl. 1798–1802), Irish architect from County Wexford
John Day (priest) (1802–1879), clergyman in the Church of Ireland
John Day (botanist) (1824–1888), English orchid collector and illustrator
John Medway Day (1838–1905), Australian journalist and activist
John Other Day (fl. 1862–1912), Native American who sought peace between Indian tribes and white settlers
John H. Day (1909–1989), South African marine biologist and invertebrate zoologist
John A. Day (1913–2008), American meteorologist, educator and sky-watching evangelist
John Day (historian) (1924–2003), American historian
John E. Day Jr. (1929–1959), American war criminal
Places
John Day, Oregon, a city
John Day River, a tributary of the Columbia River in northeastern Oregon
John Day River (northwestern Oregon), a different tributary of the Columbia River
Other uses
John Day (film), a 2013 Indian film
John Day Company, a New York publisher founded in 1926