Ian Johnston

Ian Johnston may refer to:
 * Ian Johnston (cricketer) (born 1948), former Irish cricketer
 * Ian Johnston (doctor) (1930–2001), pioneer of reproductive medicine in Australia
 * Ian Johnston (field hockey) (1929–2020), Canadian field hockey player
 * Ian Johnston (police commissioner) (born 1952), police and crime commissioner for Gwent Police
 * Ian Johnston (police officer) (born 1945), former chief constable of British Transport Police
 * Ian Johnston (rowing) (born 1947), Australian Olympic rower
 * Ian Johnston (rugby league), Australian rugby league footballer
 * Ian Johnston (soccer), Australian footballer; see Australia national soccer team records and statistics
 * Ian C. Johnston (born 1938), Canadian professor and translator of classical works
 * Ian R. Johnston (born 1943), Australian human factors engineer and road safety advocate
 * Ian Lawson Johnston, 2nd Baron Luke (1905–1996), British peer, businessman and philanthropist