| Mary Jean Stone | |
| Birth Place: | Brighton, Sussex, England |
| Death Place: | Battle, East Sussex, England |
| Occupation: | Writer |
| Nationality: | English |
| Genre: | Non-fiction |
Mary Jean Stone (born at Brighton, Sussex, in 1853; died at Battle, Sussex, 3 May 1908) was an English historical writer.
She was educated in Paris and at Aschaffenburg in Germany, where she acquired a knowledge of French, German, and Italian. In Germany she became a Roman Catholic convert, and was received into the Catholic Church by Wilhelm Emmanuel von Ketteler, then Bishop of Mainz.
On her return to England, she was encouraged as a historian by Jesuit contacts.
Her Cardinal Pole, begun for the St. Nicholas Series, was interrupted by her death. She was a frequent contributor to periodicals including the Dublin Review, The Month, Blackwood's Magazine, and Cornhill Magazine, and contributed several articles to the Catholic Encyclopedia.