Predictive analytics, powered by advancements in machine learning (ML), is reshaping the landscape of clinical psychology and mental health care. This paper explores the transformative potential of ML algorithms in early diagnosis, personalized treatment planning, and predictive risk assessments for mental health disorders. By analysing complex datasets, including behavioural, genetic, and environmental variables, ML models provide unprecedented accuracy in identifying patterns and risk factors associated with conditions such as depression, anxiety, bipolar disorder, and schizophrenia. The study highlights the integration of natural language processing (NLP) for analysing patient interactions, wearable technologies for real-time monitoring, and reinforcement learning for adaptive therapeutic interventions. The paper concludes by emphasizing a collaborative approach involving clinicians, data scientists, and policymakers to ensure equitable and effective implementation.