Transition from high school to postsecondary education (PSE) and employment can be challenging for all youth, and particularly for youth with intellectual disability (ID). Promoting equity and access to PSE for students with ID is a social justice mandate, and high school counselors are uniquely positioned to assist youth with ID in accessing appropriate PSE options. This article describes how high school counselors can effectively support the postsecondary transition needs of students with ID through applying a framework of advocacy and social justice, using the Multicultural and Social Justice Counseling Competencies.