Katie Swarts (c.1839-c.1911) was born in Michigan and most likely died in Illinois. In May 1884, she, alongside her husband, A. J. Swarts, attended the last five days of a Primary class taught in Chicago by Mary Baker Eddy. Soon afterwards she taught alongside her husband at their own metaphysical healing and teaching practice called the Spiritual Science University. Their system copied Christian Science terminology while also denying Eddy's methods. Beginning in 1885, they began publishing a monthly periodical called The Mind Cure and Science of Life (later renamed Mental Science Magazine) which regularly published articles repudiating the teachings of Eddy. In late 1888, A. J. Swarts transferred ownership of Mental Science Magazine to Katie, who sold it to Ida A. Nichols in the spring of 1889. In 1892, Katie Swarts studied Christian Science with Mary A. Philbrick, a student of Mary Baker Eddy's, and asked Eddy if she could rejoin the Christian Science movement. Eddy's reply is not extant and there is no record of Katie Swarts joining The First Church of Christ, Scientist.

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