Jane Mary Thorne, baronne de Pierres (1821 – 1873) was a French courtier of American origin.

After the introduction of the Second Empire and the marriage of Emperor Napoleon III to Eugénie de Montijo, she was appointed to the Household of the new Empress.

The ladies-in-waiting of the new Empress consisted of a Grand-Maitresse or senior lady-in-waiting, the Princesse d'Essling; a Dame d'honneur or deputy, the Duchesse de Bassano, who both attended court on grand functions; and six (later twelve) Dame du Palais, who were selected from among the acquaintances to the Empress prior to her marriage, and who alternated in pairs fulfilling the daily duties.

A contemporary said of her: Jane Thorne was described as an excellent rider, and often accompanied the empress during riding or hunting,[8] along with her husband, the equerry.

A contemporary described her: She belongs to the ladies-in-waiting depicted with Eugenie in the famous painting Empress Eugénie Surrounded by her Ladies in Waiting by Franz Xaver Winterhalter from 1855.