Professional reflection plays a critical role in fostering transversal competencies among future teachers. These competencies, encompassing critical thinking, communication, collaboration, and adaptability, are essential for navigating the complexities of modern education. This article examines the theoretical underpinnings of professional reflection, its application in teacher training programs, and its impact on transversal competency development. The study integrates qualitative and quantitative analyses, supported by illustrative examples and tables summarizing key findings.