Purpose Speech-language pathologists (SLPs) are often the first point of contact for families of children with autism. Despite this, little is known about SLPs’ understanding of autism and its early indicators. This study sought to investigate what Australian SLPs know about autism, the early indicators, and the actions they take when they identify these characteristics. Method A 34 question cross-sectional online survey was distributed through professional networks, social media channels, and industry contacts to Australian SLPs. Quantitative and qualitative data were analysed. Result The 70 participants worked in various contexts around the country. The majority of participants demonstrated sound knowledge of the main characteristics of autism, and some early indicators. Quantitative analysis identified a significant correlation between participant age and confidence talking to parents about possible autism. Overarching themes were identified: (a) caution may delay or prevent SLPs from taking action, (b) some factors may influence SLPs’ action, and (c) SLPs take action. Conclusion Australian SLPs working with children have the knowledge and understanding of the main characteristics of autism and some early indicators. However, they demonstrate a cautious approach around the subject of autism, and this caution may cause delays for children requiring diagnostic services.