List of Famous people named John

John Nash was one of the foremost British architects of the Regency and Georgian eras, during which he was responsible for the design, in the neoclassical and picturesque styles, of many important areas of London. His designs were financed by the Prince Regent, and by the era's most successful property developer, James Burton, with whose son Decimus Burton he collaborated extensively.

John of Islay (1434–1503), Earl of Ross, fourth Lord of the Isles, and Mac Domhnaill, was a pivotal figure in late medieval Scotland: specifically in the struggle for power with James Stewart, James III of Scotland, in the remoter formerly Norse-dominated regions of the kingdom. His defeat in this conflict led to rebellion against John by his illegitimate son Angus Óg, resulting in the defeat of John's fleet at the Battle of Bloody Bay in the early 1480s. Thereafter and until his death in 1503 John remained an inconsequential figure while, until his murder in 1490, Angus continued to dominate the affairs of Clan Donald. In 1493 James IV brought the Lordship of the Isles to an end.

John von Collas born Jean de Collas was a late Baroque architect of the 18th century.

John Baptist Mary David, S.S., was a French-born prelate of the Roman Catholic Church in the United States. He served as bishop of the Diocese of Bardstown in Kentucky from 1832-33.

John Langdon Haydon Down was a British physician best known for his description of the genetic condition now known as Down syndrome, which he originally classified in 1862.

John Halgren of Abbeville was a French scholastic philosopher and writer of sermons, papal legate and cardinal.