War leaves permanent and devastating effects on individuals and communities, particularly children. Conflicts in regions such as Gaza, Sudan, Ukraine, and Yemen strip children of their fundamental rights to safety, stability, and a normal childhood, profoundly impacting their cognitive, emotional, and physical development. This chapter examines the mental health consequences of war on children using Bronfenbrenner’s Bioecological Theory of Human Development, which highlights the dynamic interplay between individual characteristics, processes, and environmental systems. Children in war zones face unimaginable hardships, including violence, grief, and the premature assumption of adult responsibilities, which disrupt their developmental trajectories. The chapter delves into the systemic and cultural factors that exacerbate these challenges, such as the collapse of daily routines and social structures essential for healthy development. Additionally, it critiques the role of geopolitical dynamics in shaping the treatment and perception of war-affected children, often influenced by partialities that determine the level of support and intervention they receive. By analyzing these experiences through a Bioecological Theory of Human Development multidimensional lens, the chapter seeks to shed light on the invisible and often overlooked traumas endured by children in conflict zones. Ultimately, it underscores the urgent need for targeted interventions to protect and support these children.