Margaret Elizabeth Cooper (née Douglas; 25 January 1918 – 18 July 2016) was a member of the Women's Royal Naval Service during the Second World War who worked at the signal interception and deciphering centre at Bletchley Park, England.

Cooper was born Margaret Elizabeth Douglas in Punta del Este, Uruguay, on 25 January 1918.

[1] She then became assistant to Frank Birch, head of the naval section in Hut 4, which was known as the "U-boat room".

[1] In 1945, she married Craig Cooper, a Royal Canadian Air Force officer, whom she had met three years earlier.

[3] Later in 1942, she received a letter addressed to "the blonde Wren from Argentina on the platform at Bletchley station".