Mary Moncrieffe Livingston Ripley (May 11, 1914 – April 15, 1996) was a U.S. horticulturist, entomologist, photographer, and scientific collector.

[5] After she married, she accompanied her husband on ornithological and entomological expeditions to India, Bhutan, Indonesia and Irian Jaya.

Ripley's work of organizing volunteers led to the creation of the Smithsonian Institutions Women's Committee.

[6] While stationed in Sri Lanka (then known as Ceylon) and working for the OSS, she met Sidney Dillon Ripley.

They married in 1949, and were the parents of three daughters:Julie Dillon Miller, Rosemary L. Ripley, and Sylvia McNeill Addison.