Alphonsine J. A. Demarez (1865-1926) was born in Boussu, Hainaut, Belgium, and died in an unknown location. She was a member of the Roman Catholic Church before becoming a student of Laura V. Lathrop, who was a student of Mary Baker Eddy's. Demarez was one of the first Christian Scientists in France and worked closely with Lucy A. Brookins there. She was a Trustee of First Church of Christ, Scientist, Paris, France, as well as First Reader. Demarez joined The First Church of Christ, Scientist, in Boston, Massachusetts, on April 6, 1895. She was instrumental in having Christian Science represented at the 1900 Paris Exposition. Eddy wrote that she was "glad of the opportunity to commit to their [Demarez and Brookins] care the disposal of my books and of the loyal C.S. literature on the exhibition grounds..." It was on this occasion that Eddy gave permission (possibly a first) for some of her writings to be translated into French. In 1901, at the invitation of Eddy, Demarez took the Normal class taught by Edward A. Kimball in the Board of Education of The First Church of Christ, Scientist. Demarez was listed in the directory of The Christian Science Journal as a Christian Science teacher and practitioner in Paris from 1898-1908 and in Nice, France, from 1909-1914.

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