Nova Scotian Institute of Science - Hall of Fame
- Constance Ida MacFarlane
- Born: 5 December 1904, Charlottetown, Prince Edward Island
- Died: 2000, Halifax, Nova Scotia
- Field: Botany, specializing in seaweeds
Constance Ida MacFarlane was one of a few women scientists working in Nova Scotia in the early 1900s. Her work on the ecology of seaweeds influenced the commercial harvesting in the region and elsewhere. She served as Director of the Seaweeds Division, Nova Scotia Research Foundation from 1949-1970. Her contributions through publication of books and articles reached an international audience and her legacy in science continues through awards in her honour at Dalhousie, Acadia and UPEI.