The primary objectives were to (a) identify current published research in electronic health (eHealth) and mobile health (mHealth) interventions for youth undergoing cancer treatment and child, adolescent, and young adult survivors of childhood cancer and (b) critically appraise the current scientific evidence on their effectiveness and efficacy. As an exploratory aim, we identified pediatric cancer patients' and survivors' perceptions, attitudes, and concerns related to eHealth and mHealth interventions.