The field of Applied Behavior Analysis has been undergoing a shift towards increasing diversity, multiculturalism, and cultural humility in the past few years. A collective call to action was sent in 2019 in a special issue of Behavior Analysis in Practice, calling for increased diversity and representation within the field, from the institutional level down to practitioners and researchers. Articles, discussions, and reports have been published on increased attention to cultural humility towards clients and stakeholders, as well as practitioners. Little attention has been provided, however, to the diversity of Behavior Analysis Certification Board supervisees. Disability of supervisees has not yet been addressed in the field, and as practitioners and supervisors, it is critical to have the necessary knowledge and skills to be able to train and shape the behavior of supervisees with disabilities. The present paper reviews the literature, research, and best practices from the field of psychology; recommendations and examples of tools are provided to create a disability-affirming environment in the field of Applied Behavior Analysis.