Feedback is a complex socio-cultural construct, utilising various modalities over the lifespan of a research candidature. This study reports findings from a review of global literature on supervisory feedback to postgraduate research students. Three focus questions guided the review: students' problems in receiving feedback, perceptions of positive feedback strategies, and potential improvements to the feedback process. The review method combined a systematic search process with explicit inclusion and exclusion criteria applied to literature published over the last decade. A detailed content analysis of 43 articles is reported in a thematically ordered narrative. Findings suggested that problems with feedback were found to be caused by the content, processes involved and the expectations of those involved. Second, feedback strategies that positively impacted learning and teaching capabilities of both students and supervisors were identified as most effective. Third, improvements to the feedback process were canvassed through the three key actors of institutions, supervisors and students, providing insights into the synergistic relationship among these actors. Further research is warranted as feedback processes and products are at the mercy of research supervision, which is increasingly operating in online environments spanning different time zones, with professional, cultural and linguistic diversities impacting feedback processes and products.