Blanche S. Shannon (1859-1937) was born in Bridgetown, Barbados, and died in Montreal, Quebec, Canada. Shannon emigrated with her family to Montreal in the 1870s and worked as a governess. She, along with her twin sister Constance S. Shannon, were younger sisters of Clara M. Sainsbury Shannon, who was a student of Mary Baker Eddy's. The sisters took an interest in Christian Science in 1887 after being healed through reading Science and Health with Key to the Scriptures. Shannon joined The First Church of Christ, Scientist, in Boston, Massachusetts, on January 1, 1898. She was a member of Second Church of Christ, Scientist, Montreal, where she served as First Reader. In 1909, she served on the committee that worked to unite First and Second Churches of Christ, Scientist, Montreal. She took Christian Science Primary class instruction from her sister, Clara M. Sainsbury Shannon. Shannon was listed in the directory of The Christian Science Journal as a Christian Science practitioner in Montreal from 1903 until her passing.

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