Lunatic asylums formed part of the civic infrastructure that was constructed out of British colonists invading and subsequently colonising unceded, Indigenous Australian lands during the eighteenth and nineteenth century. This historical narrative examined nineteenth century primary and secondary sources including, patient lists, medical files, and government correspondence, to provide insight into the experiences of Indigenous Australians admitted to Australia's earliest lunatic asylums. Awareness that lunatic asylums formed part of the structure imposed during colonisation, provides nurses and other health professionals with greater historical literacy regarding the impact of colonial lunatic asylums on Indigenous Australians. Such impacts continue to be experienced through transgenerational trauma and emphasise the importance of culturally safe mental health services.