Dorothy Mary Mackay (née Simmons, 11 November 1881–8 February 1953) was a British archaeologist working in Egypt, Iraq, and sites of the Indus Valley civilisation. In 1940, she was appointed an assistant keeper at the Department of Antiquities, Ashmolean Museum at Oxford, and in years 1948–1951 she acted as a curator at the Archaeological Museum of the American University of Beirut.

In 1912, Dorothy married the archaeologist Ernest J. H. Mackay, with whom she often cooperated in later years.

She was a member of the Croydon Branch of the Women's Social and Political Union.