John MacDermott

John MacDermott may refer to:


 * John MacDermott, Baron MacDermott (1896–1979), Northern Irish politician and lawyer
 * John MacDermott (judge) (1927–2022), Northern Irish barrister and judge
 * Seán Mac Diarmada (1883–1916), Irish rebel, leader in the 1916 Easter Rising in Ireland (born John MacDermott)