Aim(s):To estimatethe prevalence of burnout risk among nurses during the peak of the first wave of the COVID-19 pandemic in Belgium andtoidentify risk groups and protective and risk factors.

Background: Nurses are at high risk of burnout and this can have negative consequences for them,patients, and healthcare systems. The pandemic may have changed their working conditions and increased their risk of burnout.

Methods:The risk of burnout was assessed through the Maslach Burnout Inventory Scale. Information on sociodemographic and working conditions during the pandemic wasalso collected. We obtained 4 552 respondents through convenience sampling.

Results: A high risk of burnout was found in 70% of respondents. The main risk factors of burnout were the lack of personal protective equipment, changes in perceived workload, and working with COVID-19 patients.

Conclusion(s): An uneven workload for nurses is an underlying problem during the COVID-19 pandemic and a significant risk factor for their burnout. The decreasedworkload is a risk factor for burnout as important as increased workload and repeated exposure to COVID-19.