Ethel Eleanor Mary Cosh, FSA, (born 3 March 1919) is an freelance journalist and local historian known for her works on the history of Islington, London. Her book, A history of Islington (2005), was the first full-length history of the area since the mid-nineteenth century. She has also written two historical works relating to Scotland.
Mary Cosh was born in Bristol on 3 March 1919 to Arthur Strode (a director) and Ellen (Janisch) Cosh.She was educated at Clifton High School.
Cosh worked with the Ministry of Labour from 1937 to 1942. During the Second World War she served with the Women's Royal Naval Service from 1942 to 1945 where she became a Leading Wren. After the war she read English at St Anne's College, University of Oxford, graduating with a BA in 1949.From 1950 to 1951, Cosh worked with the Council of Industrial Design during the time of the Festival of Britain. Since 1953, she has been a freelance writer and researcher for other authors. Among other journals, she has written for The Spectator, The Times and Country Life.
Cosh has written extensively on the history of Islington, including her masterwork, A history of Islington, published by Historical Publications in 2005,which was the first full length history of the area since the mid nineteenth century. She has also written two historical works relating to Scotland, firstly Inveraray and the Dukes of Argyll with Ian Lindsay, published by Edinburgh University Press in 1973, and more recently Edinburgh, the golden age, published in 2005. That work dealt with the social and cultural life of Edinburgh during the Scottish Enlightenment, covering the period 1760 to 1832 and drawing on contemporary accounts in literature, newspapers, letters and journals. Cosh became a fellow of the Society of Antiquaries of London in 1986.