Objectives: to prepare and validate an illustrated guide to instruct family members on clean intermittent bladder catheterizarion in children. Method: a methodological research study carried out between January 2021 and February 2022 and developed in three stages: Bibliographical review and elaboration of the illustrated guide; Content validation by expert judges (Delphi technique); and Validation of the response process by representatives of the target audience. The study was conducted in the specialties outpatient service of a large-sized university hospital from the municipality of São Paulo, Brazil. The sample consisted of 18 expert judges and 9 mothers of children undergoing clean intermittent bladder catheterization and in outpatient care. Agreement levels equal to or greater than 80% were considered as consensus, and a 0.80 rate was the acceptable minimum for the Content Validity Index. Results: the illustrated guide consists in 18 sessions, from the step-by-step instructions for clean intermittent bladder catheterization to including children in the procedure. In the first and second validation rounds with the evaluators, Content Validity Index values of 0.8 and 1.0 were obtained, respectively. In the validation by the target audience, 100% agreement was reached in the understanding, Appeal, Self-efficacy, Cultural acceptability and Persuasion domains. Conclusion: the illustrated guide proved to be valid in terms of content by the judges and family members, with the potential to mediate the educational practice in care settings for children in need of clean intermittent bladder catheterization.