List of Famous people named John

John II Komnenos or Comnenus was Byzantine emperor from 1118 to 1143. Also known as "John the Beautiful" or "John the Good" (Kaloïōannēs), he was the eldest son of Emperor Alexios I Komnenos and Irene Doukaina and the second emperor to rule during the Komnenian restoration of the Byzantine Empire. John was a pious and dedicated monarch who was determined to undo the damage his empire had suffered following the Battle of Manzikert, half a century earlier.

John William "Jack" Vessey Jr. was a career officer in the United States Army. He attained the rank of general, and is most notable for his service as the tenth Chairman of the Joint Chiefs of Staff.

John Harrison is an American ice cream taster, who worked for ice cream company Dreyer's as its "Official Taste Tester".

John Andrew Light is an English television, theatre, and film actor. He has received a Laurence Olivier Award nomination for his supporting performance in the play Taken at Midnight (2014).

John Paul Densmore is an American musician, songwriter, author and actor. He is best known as the drummer of the rock band The Doors, and as such is a member of the Rock and Roll Hall of Fame. He appeared on every recording made by the band, with drumming inspired by jazz and world music as much as by rock and roll.

John Kourkouas, also transliterated as Kurkuas or Curcuas, was one of the most important generals of the Byzantine Empire. His success in battles against the Muslim states in the East definitively reversed the course of the centuries-long Byzantine–Arab Wars and began Byzantium's 10th century "Age of Conquest".

John Gould FRS was an English ornithologist and bird artist. He published a number of monographs on birds, illustrated by plates that he produced with the assistance of his wife, Elizabeth Gould, and several other artists, including Edward Lear, Henry Constantine Richter, Joseph Wolf and William Matthew Hart. He has been considered the father of bird study in Australia and the Gould League in Australia is named after him. His identification of the birds now nicknamed "Darwin's finches" played a role in the inception of Darwin's theory of evolution by natural selection. Gould's work is referenced in Charles Darwin's book, On the Origin of Species.

John James Rickard Macleod, was a Scottish biochemist and physiologist. He devoted his career to diverse topics in physiology and biochemistry, but was chiefly interested in carbohydrate metabolism. He is noted for his role in the discovery and isolation of insulin during his tenure as a lecturer at the University of Toronto, for which he and Frederick Banting received the 1923 Nobel prize in Physiology or Medicine. Awarding the prize to Macleod was controversial at the time, because according to Banting's version of events, Macleod's role in the discovery was negligible. It was not until decades after the events that an independent review acknowledged a far greater role than was attributed to him at first.

John I was king of the Crown of Castile from 1379 until 1390. He was the son of Henry II and of his wife Juana Manuel of Castile. He was the last monarch of Castile to receive a formal coronation.

John Mowbray, 3rd Duke of Norfolk, KG, Earl Marshal was a fifteenth-century English magnate who, despite having a relatively short political career, played a significant role in the early years of the Wars of the Roses. Mowbray was born in 1415, the only son and heir of John de Mowbray, 2nd Duke of Norfolk, and Katherine Neville. He inherited his titles upon his father's death in 1432. As a minor he became a ward of King Henry VI and was placed under the protection of Humphrey, Duke of Gloucester, alongside whom Mowbray would later campaign in France. He seems to have had an unruly and rebellious youth. Although the details of his misconducts are unknown, they were severe enough for the King to place strictures upon him and separate him from his followers. Mowbray's early career was spent in the military, where he held the wartime office of Earl Marshal. Later he led the defence of England's possessions in Normandy during the Hundred Years' War. He fought in Calais in 1436, and during 1437–38 served as warden of the east march on the Anglo-Scottish border, before returning to Calais.