McIntyre was born in Sydney. Her parents, Sir Tannatt Edgeworth David, a geologist and Antarctic explorer, and Caroline Martha David, a teacher, had moved to Australia in 1882. She was encouraged to become educated and studied for a Bachelor of Arts at the University of Sydney, graduating in 1907.
McIntyre was widely involved in the community and for these services she was awarded an OBE in 1948. Her activities included serving as the State Commissioner for Girl Guides, serving on the board of the Queen Victoria Hospital and the ABC advisory committee. She was the vice-president of the Young Women’s Christian Association (YWCA). She was also involved in the establishment of the Brooks Community School in Launceston, and ran a youth drama group.
In 1948 she was elected as an independent candidate for the seat of Cornwall, becoming the first woman in the Tasmanian Legislative Council. Six months after her election, while returning from a National Council of Women of Australia Conference in Brisbane, she was killed in the crash of the Lutana near Quirindi on 2 September 1948. She was aged 61.
- Papers of the David Family at the National Library of Australia
- Ferrall, R. A. McIntyre, Margaret Edgeworth (1886–1948) In: Australian Dictionary of Biography. National Centre of Biography, Australian National University. Retrieved 2 January 2014.
|Tasmanian Legislative Council|
|Member for Cornwall