| Marguerite Françoise de Buffon | |
| Birth Place: | France |
| Death Place: | England |
| Nationality: | French |
| Other Names: | French noble |
| Spouse: | Wife of Georges Louis Marie Leclerc de Buffon |
| Partner: | Mistress of Louis Philippe II, Duke of Orléans |
| Children: | Victor du Buffon |
| Mother: | Élisabeth Amaranthe Jogues de Martinville |
| Father: | Guillaume François de Cepoy |
Marguerite Françoise Bouvier de la Mothe de Cepoy (1767–1808), known as Countess de Buffon, was a French noble, known as the royal mistress of Louis Philippe II, Duke of Orléans from 1784 until 1793.[1]
She was the daughter of marquis Guillaume François de Cepoy and Élisabeth Amaranthe Jogues de Martinville and married count Georges Louis Marie Leclerc de Buffon (1764-1794) in 1784; the same year, she became the lover of Orléans, with whom she had a son, count Victor du Buffon (1792-1812). During the Terror, she helped the legitimate sons of Orléans escape prison. In 1794, she divorced and emigrated to England, where she became a supporter of Louis Philippe.