Joseph Johnston (20 August 1890 – 1972) was an Irish academic, farmer, writer and politician. He was born in 1890 in Toomog townland, Castlecaulfield, County Tyrone, to John Johnston, a national school teacher, and Mary Geddis. He was educated at Dungannon Royal School (1902–06), Trinity College, Dublin (1906–10, BA (Mod) in Classics) and Lincoln College, Oxford (1910–12). He was the author of Civil War in Ulster (1913) and The Nemesis of Economic Nationalism (1934). He became Professor of Applied Economics in Trinity College, Dublin in 1939. His was the father of Irish physicist Roy Johnston.