Orrilla W. Day (1833-1907) was born in Wyalusing, Pennsylvania, and died in River Forest, Illinois. She was a student of Mary Baker Eddy's, completing the Primary (1886) and Obstetrical (1888) classes. She joined the Christian Scientist Association on April 7, 1886. On June 30, 1894, she joined The First Church of Christ, Scientist, in Boston, Massachusetts, and was a member until her passing. Day was a Christian Science practitioner and teacher listed in the directory of The Christian Science Journal from 1888 until 1907. She contributed to the early growth of Christian Science in Chicago and was a member of First Church of Christ, Scientist, Chicago.

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