Literature has described high levels of mental health problems among trans people, such as depression, resulting in increased levels of non-suicidal self-injury (NSSI) behaviour and suicidality (suicidal thoughts, suicide attempts and suicide rates). With the aim of systematically reviewing the available literature in this field, this study identifies 31 papers that explore the rates of NSSI and suicidality in trans people. From reviewing the literature, it was revealed that trans people have a higher prevalence of NSSI and suicidality compared to the cisgender (non-trans) population. There appear to be some gender differences within these rates, with trans men at a greater risk for NSSI behaviour. Prevalence rates differ depending on the different stages of transition, but they are still overall greater than the cisgender population. The study concludes that trans individuals are at a greater risk of NSSI behaviour and suicidality than the cisgender population, and discusses risk factors and the need to develop effective preventative interventions.