Burnout and other psychological comorbidities were evident prior to the COVID-19 pandemic for critical care healthcare professionals (HCPs) who have been at the forefront of the health response. Current research suggests an escalation or worsening of these impacts as a result of the COVID-19 pandemic.The objective of this study was to undertake an in-depth exploration of the impact of the evolving COVID-19 pandemic on the wellbeing of HCPs working in critical care.This was a qualitative study using online focus groups (n = 5) with critical care HCPs (n = 31, 7 medical doctors and 24 nurses) in 2021: one with United Kingdom-based participants (n = 11) and four with Australia-based participants (n = 20). Thematic analysis of qualitative data from focus groups was performed using Gibbs framework.Five themes were synthesised: transformation of anxiety and fear throughout the pandemic, the burden of responsibility, moral distress, COVID-19 intruding into all aspects of life, and strategies and factors that sustained wellbeing during the pandemic. Moral distress was a dominant feature, and intrusiveness of the pandemic into all aspects of life was a novel finding.The COVID-19 pandemic has adversely impacted critical care HCPs and their work experience and wellbeing. The intrusiveness of the pandemic into all aspects of life was a novel finding. Moral distress was a predominate feature of their experience. Leaders of healthcare organisations should ensure that interventions to improve and maintain the wellbeing of HCPs are implemented.