Ruth R. Ewing (1871-1946) was born in Quincy, Illinois, and died in an unknown location. She was the daughter of Ruth B. Ewing and William G. Ewing, both students of Mary Baker Eddy's and active in many capacities in the Christian Science movement in Chicago, Illinois, and Boston, Massachusetts. She studied Christian Science with her mother. She joined The First Church of Christ, Scientist, in Boston, in June 1905 and was also a member of the First Church of Christ, Scientist, Chicago. She was listed in The Christian Science Journal as a practitioner in Highland Park, Illinois, from 1926 until 1940. Ewing was also an animal rights activist. She served on the executive committee of the Illinois Humane Society for many years, was the editor of the Humane Advocate, the associate editor of the National Humane Review, and frequently lectured on the subject of anti-cruelty to animals. With Josephine A. Trott, Ewing coauthored The Book of the Beastie, a children's book of stories, poems, and illustrations teaching the humane treatment of animals, published in 1912. Ewing and Trott adopted a daughter together in 1915.

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