Maude Elizabeth Seymour Abbott (March 18, 1868[Note 1] – September 2, 1940) was a Canadian physician, among Canada's earliest female medical graduates, and an internationally known expert on congenital heart disease.

[4] Both of her parents were absent during infancy,[5] as her mother had died of tuberculosis when Abbott was 7 months old and her father had abandoned her and her older sister, Alice.

[11] In 1905,[6] she was invited to write the chapter on "Congenital Heart Disease" for William Osler's System of Modern Medicine.

"[11] The article would place her as the world authority in the field of congenital heart disease.

[11] In 1910, Abbott was awarded an honorary medical degree from McGill and was made a lecturer in Pathology; this was eight years prior to the university admitting female students to the Faculty of Medicine.

[7] After a much conflict with Dr. Horst Oërtel, she left McGill to take up a position at the Women's Medical College of Pennsylvania in 1923.

[7] In 1943, Diego Rivera painted her in his mural for the National Institute of Cardiology of Mexico City.

In the same year, Canada Post issued a forty-six cent postage stamp entitled The Heart of the Matter in her honour.

The clinic has carried her name proudly for many years - originally at the Royal Victoria Hospital site and now continuing at the new M.U.H.C.