This systematic review assessed the validity of screening instruments to identify the risk of suicide and self-harm behaviour in offenders. A search of 11 electronic databases and grey literature resulted in the inclusion of five studies. The five studies revealed four screening instruments, including the Suicide Checklist, the Suicide Probability Scale, Suicide Concerns for Offenders in Prison Environment (SCOPE), and the Suicide Potential Scale. Two instruments, SCOPE and Suicide Potential Scale, shared promising levels of sensitivity and specificity. The reporting of information was generally varied across items on the Standards for the Reporting of Diagnostic accuracy (STARD). Research is needed to assess the predictive validity of tools for offender populations in the identification of those at risk, particularly those in probation and community settings.