Objective This study aimed to create core outcome sets (COSs) for use in research studies relating to the awareness and clinical management of reduced fetal movement (RFM). Design Delphi survey and consensus process. Setting International. Population A total of 128 participants (40 parents, 19 researchers and 65 clinicians) from 16 countries. Methods A systematic literature review was conducted to identify outcomes in studies of interventions relating to the awareness and the clinical management of RFM. Using these outcomes as a preliminary list, stakeholders rated the importance of these outcomes for inclusion in COSs for studies of: (i) awareness of RFM; and (ii) clinical management of RFM. Main outcome measures Preliminary lists of outcomes were discussed at consensus meetings where two COSs (one for studies of RFM awareness and one for studies of clinical management of RFM). Results The first round of the Delphi survey was completed by 128 participants, 66% of whom (n = 84) completed all three rounds. Fifty outcomes identified by the systematic review, after multiple definitions were combined, were voted on in round one. Two outcomes were added in round one, and as such 52 outcomes were voted on in two lists in rounds two and three. The COSs for studies of RFM awareness and clinical management are comprised of eight outcomes (four maternal and four neonatal) and 10 outcomes (two maternal and eight neonatal), respectively. Conclusions These COSs provide researchers with the minimum set of outcomes to be measured and reported in studies relating to the awareness and the clinical management of RFM.