Demand for post-acute stroke and traumatic brain injury (TBI) rehabilitation outweighs resource availability. Every day, clinicians face the challenging task of deciding which patient will benefit or not from rehabilitation. The objectives of this scoping review were to map and compare factors reported by clinicians as influencing referral or admission decisions to post-acute rehabilitation for stroke and TBI patients, to identify most frequently reported factors and those perceived as most influential. We searched four major databases for articles published between 1946 and January 2021. Articles were included if they reported clinician's perceptions, investigated referral or admission decisions to postacute rehabilitation and focused on stroke or TBI patients. Twenty articles met inclusion criteria. The International Classification of Functioning, Disability and Health framework was used to guide data extraction and summarizing. Patient-related factors most frequently reported by clinicians were patient's age, mental status prior to stroke or TBI and family support. The two latter were ranked amongst the most influential by clinicians working with stroke patients, whereas age was ranked of low importance. Organizational factors were reported to influence decisions (particularly availability of post-acute care services) as well as clinicians' characteristics (e.g., knowledge). Moreover, clinicians' prediction of patient outcome ranked amongst the most important driver of referral or admission 3 decisions by clinicians working with stroke patients. Findings highlight the complex nature of decision-making regarding patient selection for rehabilitation and provide insight on important factors frontline clinicians need to consider when having to make rapid decisions in high-pressured acute care environments.