The objective of this study is to capture the importance of Foucault's discourse theory for social work. For this reason, theoretical foundations of Foucault's notion of discourse as well as their characteristics are connected with discourses in social work. Foucault's notion of discourse exhibits a duality, which on the one hand refers to the control and regulation of discourses and on the other hand to the production of reality through them. Furthermore, these findings are linked with aspects of power relations within societies, offering a more comprehensive view. It is shown that an examination of discourses in social work through Foucault’s eyes not only reveals power relations within the discourse of social work, but also deconstructs existing paradigms and realities. In addition, the control and disciplining of clients through social work is demonstrated, which is possible following the previous construction of these "others". Finally, the resulting consequences for the professionalisation of social work are discussed and compared to the possibility of a de-professionalisation.