Child poverty refers to the phenomenon of children living in poverty. This applies to children that come from poor families or orphans being raised with limited, or in some cases absent, state resources. Children that fail to meet the minimum acceptable standard of life for the nation where that child lives are said to be poor. In developing countries these standards are lower and when combined with the increased number of orphans the effects are more extreme.

The legal definition of children in most countries is 'persons under the age of eighteen', while biologically the transition from childhood to adulthood is said to occur with the onset of puberty. Culturally defining the end of childhood is more complex, and takes into account factors such as the commencement of work, end of schooling and marriage as well as class, gender and race. According to the United Nations Children's Fund (UNICEF) "children living in poverty are those who experience deprivation of the material, spiritual and emotional resources needed to survive, develop and thrive, leaving them unable to enjoy their rights, achieve their full potential or participate as full and equal members of society". The ChildFund International (CFI) definition is based on Deprivation (lack of materialistic conditions and services), Exclusion (denial of rights and safety) and Vulnerability (when society can not deal with threats to children). Other charitable organisations also use this multi-dimensional approach to child poverty, defining it as a combination of economic, social, cultural, physical, environmental and emotional factors. These definitions suggest child poverty is multidimensional, relative to their current and changing living conditions and complex interactions of the body, mind and emotions are involved.