Background: Australian publicly funded mental health services play a significant role in the assessment and management of mental illness for people with intellectual disability. However, there is limited knowledge on their preparedness to meet the needs of this population. Method: Public mental health professionals (n=566) completed an online survey that explored their attitudes, confidence, and training needs in the area of intellectual disability mental health. Descriptive analyses were undertaken. Results: Participants agreed that people with intellectual disability have the right to receive good mental health care, and have the same access to their service. They viewed treating them as part of their role, but given the resources available it was not possible to provide comprehensive care. Participants reported low confidence in key clinical areas and insufficient training. Conclusions: A comprehensive workforce development strategy is required to facilitate the engagement and capacity of public mental health professionals in this area.