Blanche Margaret Meagher, OC (January 27, 1911 – February 25, 1999) was a Canadian diplomat who became the nation's first-ever appointed female ambassador.

She was also High Commissioner to Cyprus, Uganda and Kenya, and chaired the International Atomic Energy Agency Board of Governors from 1964 to 1965.

[3] In 1942, in response to the Canadian wartime effort in World War II, the Department of External Affairs held special competitions as an "emergency measure"[4] to recruit educated women as clerks to temporarily replace the officers who had left to fight in Europe.

Meagher was one of twelve women who passed the foreign service entrance examination and became the first female diplomats to join the department.

[5] In 1944–45, Meagher was temporarily posted to Washington, D.C., to replace various diplomats who were recalled to assist in the repatriation of Canadian troops toward the end of the war.

[9] She was then transferred to London, serving under Norman Alexander Robertson,[10] and appointed to the rank of First Secretary (1953–1955) on the Canadian High Commission, and later to the position of Counselor (1955–1956).

She broke ground with the terms she served in Israel, Austria, Kenya, Uganda, and Cyprus, as she was the first female head of mission in each of these countries.

[21] In light of her gender and social circumstances, Meagher's work in the Canadian Foreign Service is generally considered to have been significant in paving the way for women in diplomacy.

[26] Dalhousie University also developed the Margaret Meagher Fellowship in Political Science, awarded to a student entering the Master of Arts program in the field of international relations.