This article aims to show how the scientific realism proposed by the philosopher Evandro Agazzi contributes to the epistemological development of social discursive psychology. To do this, the debates led by Ian Parker and John Greenwood in the early 1990s about scientific and critical realism are addressed. In this debate, the limits of naive empiricism and discursive idealism, which began to predominate in discursive social psychology, are highlighted. Evandro Agazzi's assumptions about scientific realism are then presented to account for the contributions of scientific realism to the epistemological development of discursive social psychology.