Completing an apprenticeship has been shown to be critical to an individual's future employment, earnings and career development when compared with apprentices who do not complete. International research, notably in England, Australia and Germany, has identified factors specific to the apprentice, employer and training provision that are associated with a higher chance of completion. However, to date, there has been no comparable research in Scotland, which operates its own distinct and well-established apprenticeship system. Based on the factors identified in other countries, logistic regression was conducted on records of apprenticeship leavers in Scotland, covering the period from 2007 to 2015. Data for a total of 78,952 leavers were analysed, consisting of 59,737 completers and 19,215 non-completers. It was found that women are more likely to complete an apprenticeship than men, while those from deprived areas are less likely to complete. Apprentices employed by a large employer, those receiving training from public sector organizations and those studying for selected technical subjects are more likely to complete, as are apprentices living in an area with a high local unemployment rate. The paper considers the reasons why some apprentices are more likely to complete than others and discusses the implications for apprenticeship policy in Scotland and beyond.