During the 19th century, the Utopian economists (as Karl Marx ironically nicknamed them) developed some revolutionary projects of social organisation, breaking away from capitalism. Opposed to political violence, their writings anticipated a peaceful evolution towards a social model similar to socialism/ Some of their thoughts still seem relevant today : creation of a federation of States and of an international Parliament, ; political domination of industrialists and bankers ; productive use of army. This paper presents the thoughts of five French utopian economists who are representative of the school's diversity : Saint-Simon, Fourier, Pecqueur, Chevalier, Prouddhon