National maternity care reform has emphasised the importance of expanding midwifery-led continuity of care (MCoC) models in Australia, yet the number of models remains small as well as the number of women receiving this. The majority of the midwifery workforce in Australian public health systems is comprised of part-time workers. This aspect of the midwifery workforce demands careful consideration when attempting to change a maternity care system and sustain new models of care. Sparse research has been undertaken to explore whether part-time factors could play a role in the sustainability of MCoC in Australia. This Integrative Review aims to analyse the role that part-time practice arrangements have in the sustainability of MCoC models in Australia. Following a systematic search of research databases and screening the literature with strict eligibility criteria, six Australian research articles were identified for evaluation using an integrated convergent narrative synthesis method. The resulting themes from the synthesis suggest that part-time MCoC roles may support the sustainability of the MCoC workforce without reducing quality of care to women. In various studies, midwives reported that FTE (full-time equivalent) of 0.5 may not be sufficient to meet the demands of the job. Area-specific needs impact the operationality of practice arrangements in MCoC models. This review provides recommendations for further research in part-time arrangements in MCoC. Further considerations should be made by midwifery managers, leaders and stakeholders who are responsible for developing and supporting part-time job arrangements in caseload models of care in Australia.