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Despite strong evidence linking nutritional status to treatment efficacy and survival in pediatric cancer, significant knowledge gaps and practice variation persist globally. On 24th October 2025, the International Society of Paediatric Oncology (SIOP) Nutrition Network, in collaboration with Prinsess Máxima Center for Paediatric Oncology and the International Initiative for Pediatrics and Nutrition (IIPAN), convened the first global SIOP Nutrition Network Research Forum. The forum brought together 54 international experts from high-income countries and low- and middle-income countries to define global nutrition research strategies for pediatric oncology. The forum addressed six emerging domains: body composition and treatment outcomes; microbiome, micronutrient status and metabolic health; prehabilitation and rehabilitation strategies; validation of nutritional assessment tools, guideline development for high-income settings; insights from international multicentric research initiatives—the International Atomic Energy Agency (IAEA), SIOP Nutrition Network, the Adapted Resource and Implementation Application (ARIA) guide nutrition portal, the International Collaboration on Nutrition in Cancer (ICONIC) WHO knowledge portal; and IIPAN and the World Cancer Research Fund (WCRF) for funding strategies. Delegates identified three priority working groups, namely prehabilitation optimization, pharmacokinetics, and advocacy, with each outlining collaborative nutrition research priorities for the next five years. This forum represents a critical point in pediatric oncology nutrition research as it established the first coordinated and internationally endorsed roadmap to bridge gaps in cancer care and ensure standard nutrition care worldwide. The research priorities and collaborations will help in creating evidence to improve cancer treatment and survival rate for children globally.