Pierre Eugène Lafontaine (November 26, 1857 – April 21, 1935) was a lawyer, educator, judge and political figure in Quebec. He represented Napierville in the Legislative Assembly of Quebec from 1886 to 1890 as a Liberal. Lafontaine was the author of Droit romain published in 1912 and contributed to la Revue légale and Thémis.