Brigadier Dame Mary Joan Caroline Tyrwhitt, (22 December 1903 â 18 March 1997) was a British Army officer. She was the last director of the Auxiliary Territorial Service (ATS) and the first director of the Women's Royal Army Corps (WRAC) when it was established on 1 February 1949.
Her father was Admiral of the Fleet Sir Reginald Tyrwhitt, 1st Baronet, a Royal Navy officer.
Brigadier Dame Mary Tyrwhitt died in 1997, aged 93, unmarried.