Abstract: Couple and marital relationships play a crucial role in individual psychological well-being, family stability, and social functioning. Marital conflicts, communication breakdowns, emotional disconnection, and unresolved interpersonal issues often contribute to psychological distress, anxiety, depression, and reduced quality of life. In recent decades, the role of mental health nurses in delivering couple and marital counseling has gained increasing recognition. Mental health nurses, with their holistic, patient-centered, and therapeutic approach, are uniquely positioned to support couples in resolving conflicts, strengthening emotional bonds, and developing healthy coping mechanisms. This review article explores the theoretical foundations, practical approaches, ethical considerations, clinical competencies, challenges, and future directions of couple and marital counseling by mental health nurses. Through an analysis of existing literature, this article highlights the importance of integrating nursing perspectives into relationship-focused mental health care. Emphasis is placed on evidence-based practices, interdisciplinary collaboration, and culturally sensitive interventions. The article aims to provide a comprehensive understanding of how mental health nurses contribute to strengthening marital relationships and promoting psychological well-being among couples.