Maire MacDonagh (20 March 1918 – 3 June 1997) was an Irish trade union official, who served as general secretary of the Association of Secondary Teachers, Ireland for 25 years.
In 1936 she entered University College Galway (UCG), graduating in 1939 with a first class BA in French and Irish and a B.Comm.
She worked for a time for an insurance company in Dublin, and then taught at Sion Hill Convent, Blackrock for a few years.
From 1956 to 1958 she was secretary to the unity committee, serving as rapporteur during the talks which saw the establishment of the unified trades union congress in 1958.
She was unanimously chosen out of 91 candidates who applied for the job of general secretary of the Association of Secondary School Teachers in Ireland (ASTI), taking up the position in June 1959.