General Johnston may refer to:
United Kingdom Alexander C. Johnston (1884–1952), British Army brigadier general James Johnston (British Army officer, born 1721) (1721–1795), British Army general James Johnston (British Army officer, died 1797) (c. 1721–1797), British Army general James Johnston (British Army officer, born 1911) (1911–1988), British Army major general Maurice Robert Johnston (1929–), British Army lieutenant general Thomas Henry Johnston (British Army officer), British Army general
United States Albert Sidney Johnston (1803–1862), Confederate States Army general Gary W. Johnston (fl. 2010s–2020s), U.S. Army major general George Doherty Johnston (1837–1919), Confederate States Army brigadier general John Alexander Johnston (1858–1940), U.S. Army brigadier general Joseph E. Johnston (1807–1891), Confederate States Army general & United States Army brigadier general Richard C. Johnston (fl. 1980s–2010s), U.S. Air Force Major general Robert B. Johnston (1937–), U.S. Marine Corps Lieutenant general Robert Daniel Johnston (1837–1919), Confederate States Army brigadier general William Johnston Jr. (1861–1933), U.S. Army major general
Others George Johnston (general) (1868–1949), Australian Army major general George Napier Johnston (1867–1947), Australian Army major general Francis Earl Johnston (1871–1917), New Zealand Army brigadier general
See also George Johnstone (British Army officer), whose name is sometimes spelled "Johnston" Robert Maxwell Johnstone (1914–1990), British Army major general