John or Jack Lyon may refer to:
Clan Lyon (Scotland) John Lyon, 1st Thane of Glamis (1340–1382), Chamberlain of Scotland and progenitor of Clan Lyon John Lyon, 1st Master of Glamis (c. 1377–1435), son of the above John Lyon, 3rd Lord Glamis (1431–1497), grandson of the above John Lyon, 4th Lord Glamis (died 1500), son of the above John Lyon, 6th Lord Glamis (died 1528), son of the above John Lyon, 7th Lord Glamis (c. 1510–1558), son of the above John Lyon, 8th Lord Glamis (died 1578), Scottish nobleman, judge and Lord High Chancellor of Scotland, son of the above John Lyon, 2nd Earl of Kinghorne (1596–1646), grandson of the above John Lyon, 4th Earl of Strathmore and Kinghorne (1663–1712), grandson of the above John Lyon, 5th Earl of Strathmore and Kinghorne (1696–1715), son of the above John Bowes, 9th Earl of Strathmore and Kinghorne (born John Lyon, 1737–1776), nephew of the above John Bowes, 10th Earl of Strathmore and Kinghorne (John Lyon-Bowes, 1769–1820), son of the above John Bowes-Lyon (1886–1930), great-great-great-grandson of the 9th Earl and uncle of Queen Elizabeth II
Sport Jack Lyon (footballer) (1893–1975), English footballer John Lyon (cricketer) (1951–2010), English cricketer John Lyon (boxer) (born 1962), English boxer
Other people Sir John Lyon (lord mayor) (1514–1564), English landowner who served as Lord Mayor of London in 1554–1555 John Lyon (school founder) (c. 1514–1592), English landowner and founder of Harrow School and John Lyon's Charity and namesake of the John Lyon School, first cousin of the above John Lyon (botanist) (1765–1814) Scottish botanist and plant collector in the United States John Lyon (poet) (1803–1889), Scottish Latter Day Saint poet and hymn writer Jack Lyon (1898–1941), New Zealand politician John Lyon (civil servant) (born 1948), British civil servant Southside Johnny (John Lyon, born 1948), American singer
See also John Lyons (disambiguation)