Purpose Gastric Remnant Fundoplication (GRF) is emerging as a potential solution to managing bile or acid reflux post One Anastomosis Gastric Bypass (OAGB). This study sought to determine the post-operative outcomes of patients following GRF in primary or revisional OAGB cohorts, focusing on whether further anti-reflux surgery was required. Methods A retrospective analysis of a single surgeon’s database of patients who underwent primary (n=149) or revisional (n=27) OAGB was conducted, with attention to whether GRF for reflux was performed. Patients revised from Sleeve Gastrectomy to OAGB were excluded as GRF is not possible. The primary outcome measure was further anti-reflux surgery and secondary outcome measures included length of stay, returns to theatre and 30-day readmissions post GRF. Results In primary OAGB performed without hiatal hernia repair (HHR) or GRF (n=140), 5 patients (3.6%) subsequently underwent GRF for reflux. One of these patients (20%) underwent Roux en Y (RNY) conversion, equating to 0.7% of all primary OAGB patients. Three primary OAGB patients (2%) had a concurrent GRF due to large hiatus hernias. Six primary OAGB patients (4%) had HHR alone. One patient subsequently required GRF. None of these GRF patients required further anti-reflux surgery. In the revisional OAGB cohort (n=27), 2 patients had RNY conversion and 6 had GRF, of whom 2 were combined with Braun diversion. None required further surgery. There were no returns to theatre or 30-day readmissions. Average length of stay for GRF was 1.67 days. Conclusion GRF in primary and revisional OAGB cohorts had a low incidence of requiring further anti-reflux surgery and should be considered as an option in managing reflux in these patients.