Émile Robert Alphonse Hippolyte Janssens (1902-1989) was a Belgian military officer and colonial official, best known for his command of the Force Publique at the start of the Congo Crisis.
He described himself as the "Little Maniac" (Petit Maniaque) and was a staunch disciplinarian, but his refusal to see Congolese independence as marking a change in the nature of his command has been cited as the immediate cause of the mutiny by the Force Publique in July 1960 that plunged Congo-Léopoldville into chaos and anarchy.