Sonia Haft Greene Lovecraft Davis (March 16, 1883 – December 26, 1972) was an American one-time pulp fiction writer and amateur publisher, businesswoman and milliner who bankrolled several fanzines in the early twentieth century.

[2] Her father apparently died when she was a child in 1888, and her mother emigrated to the United States, leaving Sonia and her brother in Liverpool at the Baron Maurice de Hirsch School.

She was introduced to the world of amateur journalism four years earlier by Lovecraft's colleague James Ferdinand Morton, Jr.[6] The October after meeting him, she issued The Rainbow, a fanzine described by Reinhardt Kleiner as "a large and handsome affair, illustrated with half-tone reproductions of photographs of well-known amateurs of the day and containing excellent contributions by many of them.

Greene's best-known story is "The Horror at Martin's Beach," revised and edited by H. P. Lovecraft and retitled as The Invisible Monster when published in Weird Tales (November 1923).

She sent Lovecraft a weekly allowance that helped him pay for a tiny apartment in the then-working class Brooklyn Heights.

During this time, Lovecraft claimed in letters that he was so poor that he lived for three days on one loaf of bread, one can of cold beans, and a hunk of cheese.

It was unpublished until the mid-1980s, when it was issued in a facsimile holograph edition of 200 copies by R. Alain Everts' The Strange Company as by H. P. Lovecraft and Sonia Greene.

Her marriage to Lovecraft hadn't been dissolved—he assured her the divorce had been filed, but failed to sign the final decree, so Greene's union with Davis was technically bigamous.

Greene later resided at Diana Lynn Lodge, a home for the elderly which is still in operation in Sunland-Tujunga, Los Angeles, and died there on December 26, 1972, at age 89.