Changes in mental health are common after acquired brain injury (ABI), defined as any traumatic or non-traumatic injury to the brain after birth, affecting approximately 1 in 3 adults with ABI. Occupational therapy (OT) practitioners are uniquely qualified to contribute to addressing how mental and physical health influence engagement in activities of daily living, yet many OT practitioners working in neurorehabilitation do not implement recommended evidence-based mental health screening or intervention. This study aims to test a comprehensive implementation program for integrating evidence-based mental healthcare into OT rehabilitation services for people with ABI. The study will be conducted with OT practitioners working in home and community neurorehabilitation settings. The focus of the study is to better understand strategies to help OT practitioners adopt and implement evidence-based mental healthcare into routine practice. By doing so, the study aims to improve neurorehabilitation care delivery and promote positive mental health and community engagement among people with ABI.