Background Ayurveda emphasizes the inseparable relationship between the body (Sharira), mind (Manas), and soul (Atma) in maintaining health. Dinacharya (daily regimen) is a key preventive and promotive measure described for sustaining this harmony. Contemporary psychiatry increasingly recognizes the importance of structured routines, circadian rhythm regulation, and lifestyle hygiene in mental well-being — principles that closely parallel Ayurvedic concepts of Dinacharya. Objective To explore the psycho regulatory role of Dinacharya in maintaining and promoting mental health, integrating classical Ayurvedic principles with modern psychiatric and neurobiological insights. Materials and Methods A textual and conceptual review was undertaken from Ayurvedic classical sources such as Charaka Samhita, Sushruta Samhita, and Ashtanga Hridaya, along with modern literature from PubMed, Scopus, and standard psychiatric texts on lifestyle and circadian health. Correlative analysis was made between Ayurvedic explanations of dosha, guna, and manas balance with neurophysiological mechanisms influencing mood and cognition. Results The study revealed that Dinacharya acts through multidimensional regulation—biological, psychological, and spiritual. Practices like Brahma Muhurta Jagrana, Abhyanga, Dhyana, Vyayama, Aharakala Palana, and Nidra were found to stabilize Tridosha, enhance Sattva guna, and synchronize biological rhythms. Modern studies support that regular routines, mindful activities, exercise, and adequate sleep improve serotonin balance, vagal tone, and emotional resilience. Conclusion Dinacharya provides a holistic, time-tested behavioral framework for maintaining mental health. It bridges ancient Ayurvedic wisdom with modern lifestyle psychiatry by aligning the individual’s routine with natural rhythms, promoting Sattva guna, and enhancing psychophysiological stability. Integration of Dinacharya into preventive psychiatry and therapeutic interventions may serve as an effective, low-cost, and sustainable strategy for mental health promotion.