<p>Postmodernism has become a primary discourse within the public sphere, social movements, and academia. This has compelled nearly every branch of knowledge, including psychology, to undergo shifts in perspective and research paradigms. Numerous psychologists from both modern and postmodern traditions have explored the themes of postmodern psychology. While previous literature often fragments postmodern psychology into isolated debates on language or materiality, this article seeks to synthesize its problematics, methodology, and subjectivity into a cohesive theoretical framework. The primary novel contribution of this study lies in its reinterpretation of postmodern subjectivity—specifically the concept of “lack”—not as a psychological deficit, but as a crucial prerequisite for inclusivity and ethical engagement in the era of liquid globalization and digital fragmentation. The research employs a qualitative approach based on library research, utilizing the technique of Philosophical Inquiry into Scientific Theory. The findings reveal that the central problematics of postmodern psychology pertain to the issue of legitimacy. The methodology of postmodern psychology adopts language as its theoretical framework. The concept of subjectivity within postmodern psychology is characterized by the notion of lack. In conclusion, the positioning of problematics, methodology, and the concept of the subject within postmodern psychology establishes it as a scientific discourse or a potential new branch of psychology with a significant contribution to the global paradigm.</p>