The COVID-19 pandemic placed substantial strains on healthcare systems globally causing downstream sequalae on emergency surgical conditions including acute appendicitis. The primary aims of this study were to examine rates of complicated appendicitis, conservatively managed uncomplicated appendicitis and outcomes of acute appendicitis management before, during and after the New South Wales’ COVID-19 lockdown in Australia. Retrospective analysis of patients with acute appendicitis in a NSW local health district between 4th December 2019 and 13th October 2020 was undertaken. Patients were grouped temporally into Pre-lockdown, Lockdown or Post-lockdown groups. No significant change in the rates of complicated appendicitis during the lockdown compared to periods immediately before and after the lockdown were found. Patients with complicated appendicitis tended to be older and have longer hospital stays. Conservatively treated uncomplicated appendicitis rates did not increase during the lockdown period. The findings indicate potential for lower threshold for investigation and management of suspected acute appendicitis in older people and criteria for conservative management of uncomplicated appendicitis may require revision. Analysis of pandemic surgical rates could enhance bed management planning for future disasters, ensuring optimal patient safety. Further research is required to delineate the effect of lockdowns on acute appendicitis and may inform changes to practice.