Abstract: Since the introduction of COVID-19-related public health measures, notifications for most nationally notifiable diseases have declined when compared to previous years. Physical distancing, travel restrictions, and emphasis on hygiene are likely to have affected the number of expected notifications, with the greatest reductions observed among disease spread via person-to-person contact such as influenza, and among overseas-acquired infections such as dengue virus and measles. However, quantifying the magnitude of the effect of COVID-19 public health measures on communicable diseases in Australia will be difficult, due to confounding factors such as: changes in testing priorities in laboratories; diversion of resources to the COVID-19 response; changes in health-seeking behaviours; greater utilisation of telehealth practices; and financial impacts such as income loss and ability to afford healthcare. It is considered likely that these other factors will have also impacted notification numbers. © Commonwealth of Australia CC BY-NC-ND.