In light of corporate social advocacy (CSA), this chapter calls attention to recent corporate pullbacks from diversity, equity, and inclusion (DEI) programs. This trend not only demonstrates the limitation of corporate social responsibility (CSR) but also highlights the importance of CSA for minority groups. While CSR is often marketing-driven with focus on its consequences, CSA is value and purpose-driven, engaging with contentious sociopolitical issues to advocate for marginalized communities. This chapter centers on disability as the key intersectional minority group for being the largest minority group but also deeply associated with other minority groups such as LGBTQ people. However, disability is largely overlooked or insufficiently addressed in DEI and corporate advocacy initiatives. To provide a better understanding of the disability, this chapter introduces disability through the lens of three disability models and explores the historical context and advocacy efforts of disabled people. In addition, we review corporate advocacy practices for the disability and its authenticity in terms of five dimensions (Ciszek & Lim, 2021)—namely, continuity, credibility, integrity, symbolism, and representativeness. With a case study on Nike FlyEase, we provide theoretical and practical implications for authentic CSA development for the disability.