Dietary fibers (DFs) are essential components of human nutrition and are principally defined as non-digestible carbohydrates (oligosaccharides and polysaccharides) usually classified by their physicochemical and physiological characteristics (water solubility, viscosity, fermentability, and bulking effect). Unfortunately, there is limited information on dietary fiber recommendations for children, and the evidence on their effect on health and symptom control is mainly available for the adult population. Therefore, this review aims to give a comprehensive overview of the characteristics and dietary sources of dietary fiber and their potential health benefits in healthy children but also their potential use in the treatment of sick children.