Background: Workers in the intellectual disability sector encounter significant work-related stress impacting their mental health. This study explores the barriers faced by these workers when accessing mental health support during the pandemic. Methods: 1831 surveys were completed by intellectual disability support workers from Ontario, Canada between 2021 and 2023. This is a secondary analysis of questions focused on barriers to accessing mental health services. Results: On average, 45% of workers reported experiencing barriers to accessing mental health support each year. The cost of services and lack of time were consistently identified as barriers. Workers reporting barriers were more likely to be younger, have less than 10 years of sector-specific experience, and report significant mental distress. Conclusion: Sector-wide efforts to reduce barriers and improve the mental health of workers are critical to promote the wellbeing of the workforce and to support high-quality care for people with intellectual disabilities.