Louis Perceau (22 September 1883 – 20 April 1942) was a 20th-century French polygraph. He used several pseudonyms including Helpey bibliographe poitevin, Dr. Ludovico Hernandez, Alexandre de Vérineau, Un vieux journaliste, Radeville et Deschamps, marquis Boniface de Richequeue, sometimes jointly with Fernand Fleuret.
First a tailor, Louis Perceau was in Paris from 1901. He became editor at La Guerre sociale [fr] and La Vie socialiste and his socialist activism earned him the friendship of Jean Jaurès, Gustave Hervé and Albert Thomas, but also an arrest and imprisonment for six months (1906). He then actively participated in reforming the Socialist Party (France) in 1920.