Pierre Marie Augustin Filon (1841–1916) was a French professor of rhetoric and the author of a number of works of fiction, as well many articles, reviews and books on contemporary English politics, art and literature.

The son of the historian Charles Auguste Désiré Filon, he was born in Paris. Educated at the École normale, he lectured for some years in the Lycées of Nice and Grenoble. In October 1867, Duruy, then the French minister of education, appointed him tutor to the Prince Imperial. During the Empress's Regency in 1870, M. Filon acted as her private secretary. Upon the fall of the Second French Empire, the Prince Imperial was exiled to Chislehurst, Kent, accompanied by Filon, who settled in England with his family. He also wrote on English subjects, chiefly under the pseudonym of Pierre Sandrié.

His only child was the distinguished applied mathematician Louis Napoleon George Filon, who worked with Karl Pearson.