In this article, I explore the philosophical foundations of critical realism and its application in mixed methods research. Critical realism, a robust ontological framework, is pivotal for understanding complex phenomena that span across disciplinary boundaries. It introduces a stratified ontology that recognizes distinct layers of reality, each with unique mechanisms and causal powers. By advocating for a dialectical method, critical realism has the potential to provide a contribution to mixed method research, enhances interdisciplinary collaboration and encourages examining the interactions between different reality layers. This approach not only facilitates a holistic understanding of complex issues but also underscores the role of "tendencies rather than deterministic laws. This critical realist perspective significantly contributes to mixed methods research by promoting a democratic, pluralistic approach and enriching our grasp of the multifaceted nature of reality.