Aims and objectives: The aim of this study was to investigate the effectiveness of mindfulness-based interventions on psychological well-being, burnout and post-traumatic stress disorder symptoms among working registered nurses. Background: Nurses account for nearly half of the global healthcare workforce and are considered significant contributors in multi-disciplinary healthcare teams. Yet, nurses face high levels of psychological distress, leading to burnout and post-traumatic stress disorder. Mindfulness-based training is a strategy that has been introduced to foster a state of awareness of present physical, emotional and cognitive experiences to regulate behaviour. Design: This systematic review of randomised controlled trials was designed according to PRISMA guidelines. Eligible studies were screened and extracted. Methodological quality was evaluated by two researchers, independently. RevMan 5.4 was used to conduct the meta-analysis. Results: Fourteen studies including a total of 1077 nurses were included, of which only eleven were included in the meta-analysis as the remaining had missing or incomplete data. Meta-analysis revealed that MBI was more effective than passive comparators in reducing psychological distress, stress, depression and burnout-personal accomplishment. When compared to active comparators, MBI was also found to be more effective in reducing psychological distress and was as effective in reducing stress, anxiety, depression and burnout. Evidence on the effects of MBIs on PTSD was scarce. Conclusion: Mindfulness-based interventions can effectively reduce psychological distress, stress, depression and some dimensions of burnout. However, evidence remains scarce in the literature. There is a need for more methodologically sound research on mindfulness-based training among nurses. Relevance for clinical practice: An important aspect that relates to the success of mindfulness-based interventions is the continued and dedicated individual practice of the skills taught during mindfulness training amidst demanding clinical work environments. Therefore, relevant support for nurses must be accounted for in the planning, design and implementation of future mindfulness-based interventions.