Margaret Elizabeth Barr Bigelow (1923–2008) was a Canadian mycologist known for her contributions to the Ascomycetes fungi.
[1] After receiving her PhD, Barr-Bigelow and her husband, fellow mycologist Howard E. Bigelow, spent several months collecting fungi in Maine while searching for a teaching position.
Soon after, Barr took a position at the Botanical Institute at the University of Montreal as a National Research Council fellow.
Two years after Howard died in 1987, Margaret moved to Sidney, British Columbia where she lived until her death in 2008.
Some of Margaret's collection are also held at the Canada Department of Agriculture in Ottawa and the University of British Columbia.