People with intellectual and developmental disabilities (IDD) are disproportionately impacted by potentially traumatic experiences; however, organizations serving this population have lagged in their integration of trauma-informed care (TIC). Trauma-informed care is a systemwide response to the pervasiveness of trauma that frequently requires an organizational shift rooted in staff training. Using an online statewide survey, the present study examined beliefs and training among IDD service providers. Responses from 288 service providers suggested some alignment among beliefs and staff training content with TIC principles. Although the findings indicate a foundation for TIC, intentional efforts are needed for IDD agencies to fully embrace TIC.