All children in Aotearoa New Zealand have the right to enrol in and receive a quality, inclusive education. Despite this, a recent report by the Education Review Office (ERO, 2022), the government's external education evaluation agency, identified numerous ways in which disabled akonga are excluded from and within the education system. This article explores one of ERO's key findings: principals lack understanding of their legal obligations with respect to disabled akonga. Through contextualising this finding within national and international literature on principals' legal literacy, the urgent need for professional development (PD) to develop principals' understanding of the relevant law is highlighted. Recommendations for the content and delivery of this PD are outlined along with regulatory measures to safeguard the rights of disabled akonga.