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Background: Hepatitis B virus (HBV) is associated with several acute and long-term complications and vaccination is the cornerstone of prevention. A recent outbreak in Gulu, Uganda, one of the districts covered by a mass vaccination campaign, suggests low uptake of HBV vaccination. This study aims to determine the uptake and completion of HBV vaccination and associated factors among residents of Gulu, Uganda., Methods: A mixed methods cross-sectional study was conducted in Gulu, Northern Uganda, among 434 adult residents. A pretested questionnaire was used to collect data on socio-demographics, perceptions, and knowledge of HBV vaccination. Modified Poisson regression analysis was used in STATA 14 software to obtain prevalence ratios for the association between the independent and dependent variables. For qualitative data, 9 key informant interviews were conducted and thematic analysis was done using Quirkos software., Results: Out of the 434 respondents, 41.9% had received at least one dose of the hepatitis B vaccine, 32.5% had received at least 2 doses, and only 20% had completed all 3 doses, with an overall completion rate of 47.8% for participants who had been initiated on the vaccine. Gender, residence, risk perception of Hepatitis B infection, perceived safety of the vaccine, and awareness of mass vaccination were associated with uptake of Hepatitis B vaccination. Residence, knowledge, and perception of being at risk of acquiring Hepatitis B were associated with completion. Qualitative results revealed that the levels of uptake and completion could have been affected by access to vaccination sites; inadequate knowledge about the disease; myths about the vaccine and inadequate community engagement., Conclusion: Low Hepatitis B vaccine uptake and completion rates were observed in Gulu. To enhance vaccination coverage, future initiatives should prioritize awareness, education, and dispelling of vaccination myths. Additionally, increased government investment in training health workers can serve as a valuable strategy to improve information dissemination and awareness among the population., (© 2024. The Author(s).)