Marguerite Françoise de Buffon

{{Expand French|topic=bio|Marguerite Françoise Bouvier de la Mothe de Cepoy|date=May 2017}}

{{Infobox person

| name = Marguerite Françoise de Buffon

| image = Comtesse de Buffon.jpg

| birth_date = {{Birth year|1767}}

| birth_place = France

| death_date = {{Death year and age|1808|1767}}

| death_place = England

| nationality =

| other_names =

| occupation =

| years_active =

| known_for =

| 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.Mémoires de la Comtesse de Boigne, née d'Osmond, Paris, Mercure de France, 1971 – Tome 1, p. 165

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.