Ellen Latham Clarke (also Clark) (c.1845-1930) was born in New London, Connecticut, and moved to Dorchester, Massachusetts, in the early 1880s with her husband, Elijah P. Clark (1834-1908). She was a student of Mary Baker Eddy's, studying with her in September 1880, and was admitted to the Christian Scientist Association in December of the same year. She was one of the First Members of The Mother Church, later known as "Executive Members," who were the original members when the church was formed on September 23, 1892. There were twelve original First Members. She advertised as a practitioner of Christian Science healing in The Christian Science Journal from 1888 until 1922.

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