Margaret Deanesly (1885–1977) was an English historian who wrote on church history.
She was born 5 March 1885 to Samuel Deanesly and his wife, Clara Maria, née Dowding, and educated at Godolphin School, Salisbury, and Newnham College, Cambridge, where she achieved a double first in the History tripos in 1912. She received the Arthur Hugh Clough Scholarship in 1912.[1][2] At Newnham she was a friend and collaborator of Hope Emily Allen, who introduced Deanesly to her first scholarly project by sending her a bibliography of Richard Rolle.[3] Deanesly then received her MA from the University of Manchester in 1915 and carried out a Marion Kennedy research studentship in 1916–1917. She held a D.Litt. from the University of Lambeth.[1][2]