Purpose: Canadian correctional workers (CWs) experience substantial challenges with mental health, but prev- alence estimates have been limited across provincial and territorial services. Methods: Participating CWs from all 13 provincial and territorial services (n = 3740) self-selected to complete an online mental health and well-being survey assessing sociodemographic characteristics and symptoms of several mental disorders. Participants worked as correctional officers, community operations (e.g., probation officers), institutional operations (e.g., program officers), community administrators (e.g., managers), institutional or regional headquarters administrators, or institutional management (e.g., superintendents). Results: Across Canada, participants screened positive for one or more mental disorders (57.9%), with several regional differences (ps < 0.05). Correctional officers reported more positive screens than other CWs (ps < 0.05). Years of service and being married were inversely related with mental health (ps < 0.05). Conclusions: The current results suggest provincial and territorial CWs report mental health challenges much more frequently than the diagnostic prevalence for the general public (10.1%) and need additional supports. Unexpectedly, there were absent elevations associated with data collected after the onset of COVID-19