Ecopsychology seeks to investigate the interaction and interdependence of human behavior with the natural environment as well as its implications on well-being and health. In the past couple of years, the conglomeration of Ecopsychology and Clinical Psychology has led to the emergence of subfields like Clinical Ecopsychology and Ecopsychiatry, both focusing on the applications of the principles of ecopsychology in health promotion and well-being. The concept of Ecotherapy is based on the understanding of ecopsychology, where the physical and mental health of an individual are studied in terms of the environment and natural ecosystem. The current chapter explores the implications of clinical ecopsychology and ecotherapy in providing psychological intervention and promoting well-being. The chapter provides an outline of the fundamental principles of clinical ecopsychology and ecotherapy as subfields of environmental psychology. The methodology follows a narrative review framework, exploring contemporary research on the implications of the basic tenets of ecopsychology. The discussion focuses on two chief aspects: (a) Therapeutic interventions based on ecopsychological principles, and (b) Implications in promoting health and well-being. Applications of ecotherapy are investigated in general health conditions and psychopathological conditions like stress-related disorders, attention-deficit/hyperactivity disorder, mood-related disorders, addictions, pain disorders, and other mental health conditions. Furthermore, the review explores the role of ecopsychological principles in nurturing psychological development and creative abilities among children as well as promoting well-being and satisfaction with life among adult individuals. The chapter concludes with a note on the scopes and challenges of implementing the fundamental beliefs of ecopsychology in psychological intervention and endorsing well-being.