Muriel McQueen Fergusson, PC OC QC (May 26, 1899 – April 11, 1997) was a Canadian activist, judge and politician. Fergusson served in the Senate of Canada and the first woman Speaker of the Senate. She is known for a long career of advocating for the less privileged, most often women. She was the first woman elected, in 1950, to the Fredericton City Council as a city councilor and was the first woman deputy mayor in 1953. She was appointed to the Senate of Canada in 1953 and was the first woman Speaker of the Senate from 1972 to 1974. She retired in 1975.