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Objective: Patient and public involvement and engagement (PPIE) in research is essential in developing relevant and effective complex interventions for health. The aim is to present the planned process of patient involvement in the development of an internet intervention targeting fertility distress and sexual dysfunction among young adults following cancer.Methods: The present PPIE project is part of the Fertility and Sexuality following Cancer (Fex-Can) project, aiming to alleviate fertility distress and sexual dysfunction among young adult cancer survivors. Approximately 10 young adults (18-39 years) with experience of cancer are being recruited via patient advocacy organizations, social media, and oncology-and hematology clinics to be part of a co-research group. The collaboration will consist of 1-day meetings during which specific topics of the intervention and study design will be discussed and workshopped, including content and structure of the intervention program, recruitment strategies and patient information, as well as collaborative analysis of study results.Results: Evaluation of perceived impact of activities will be assessed using impact logs, and interviews will be conducted to examine the process and experiences of PPIE in the Fex-Can project.Conclusion and implications: Involvement of members of the target group in the development of the Fex-Can 2.0 intervention can facilitate the relevance and potential impact of our internet intervention, as well as empower individuals with lived experiences, and limit research waste.