Objectives: This article presents a Cochrane/Campbell systematic review of the evidence on the effect of parent training to support the parenting of parents with intellectual disabilities. Method: Randomized controlled trials (RCTs) comparing parent training interventions for parents with intellectual disability with usual care or with a control group were included in the review. Outcomes: The attainment of parenting skills specific to the intervention, safe home practices, and the understanding of child health were the outcomes of interest. Results: Three trials met the inclusion criteria. All three indicated improved parenting skills following parenting training. Conclusions: The quality of the evidence is moderate to low, with limited information available to assess possible bias. The presented evidence seems promising; however, there is a need for larger RCTs of interventions before conclusions can be drawn about the effectiveness of parent training for this group of parents. (Contains 2 tables.)