Social innovation and service innovation issues have developed separately over the last two decades, with too-rare intersections between them. Both issues share many points in common, however, and sometimes even describe the same socio-economic reality. This paper aims to help establish a dialogue between these two still marginal but promising fields of economic theory and the social sciences in general. It briefly describes each of these two fields, puts them into perspective, and examines the links between them in a number of different ways. JEL Codes: O30, L80, L31