Epidemiological studies indicate a worldwide increase in the prevalence of autism spectrum disorders (ASDs) over the past decade. ASDs are no longer considered rare conditions. Although the reason(s) for this rise are uncertain, research indicates that specialised intervention at an early age is vital for optimising the outcomes of children with ASD. However, not all children with milder forms of autism will be identified prior to school entrance. Hence, it is essential for educators and school-based support professionals to ensure that children who have risk factors and/or warning signs of ASD are identified and provided with special educational services as soon as possible. The aim of this article is to review five validated screening tools that hold promise for identifying at-risk school-age children in need of a more in-depth diagnostic assessment.