AimsTo undertake a Priority Setting Partnership (PSP) to establish priorities for future research in diabetes and pregnancy, according to women with experience of pregnancy, and planning pregnancy, with any type of diabetes, their support networks and healthcare professionals.MethodsThe PSP used established James Lind Alliance (JLA) methodology working with women and their support networks and healthcare professionals UK‐wide. Unanswered questions about the time before, during or after pregnancy with any type of diabetes were identified using an online survey and broad‐level literature search. A second survey identified a shortlist of questions for final prioritisation at an online consensus development workshop.ResultsThere were 466 responses (32% healthcare professionals) to the initial survey, with 1161 questions, which were aggregated into 60 unanswered questions. There were 614 responses (20% healthcare professionals) to the second survey and 18 questions shortlisted for ranking at the workshop. The top 10 questions were: diabetes technology, the best test for diabetes during pregnancy, diet and lifestyle interventions for diabetes management during pregnancy, emotional and well‐being needs of women with diabetes pre‐ to post‐pregnancy, safe full‐term birth, post‐natal care and support needs of women, diagnosis and management late in pregnancy, prevention of other types of diabetes in women with gestational diabetes, women's labour and birth experiences and choices and improving planning pregnancy.ConclusionsThese research priorities provide guidance for research funders and researchers to target research in diabetes and pregnancy that will achieve greatest value and impact.