Since the enactment of the Education for All Handicapped Children Act of 1975 (EHA), Public Law (P.L.) 94-142 and its successor statute, the Individuals with Disabilities Education Act (IDEA, or the Act), the Secretaries of the U.S. Department of Education and their predecessors, the Commissioners of Education at the U.S. Department of Health, Education, and Welfare, have been required to transmit to Congress an annual report to inform Congress and the public of the progress made in implementing the Act. The annual reports to Congress reflect a history of persistent commitment and effort to expand educational access opportunities and improve outcomes for children with disabilities. This "46th Annual Report to Congress on the Implementation of the Individuals with Disabilities Education Act, 2024" describes the nation's progress in: (1) providing a free appropriate public education (FAPE) for children with disabilities under IDEA, Part B, and early intervention services to infants and toddlers with disabilities and their families under IDEA, Part C; (2) ensuring that the rights of these children with disabilities and their parents are protected; (3) assisting States and localities in providing IDEA services to all children with disabilities; and (4) assessing the effectiveness of efforts to provide IDEA services to children with disabilities. This report provides summaries and analyses of IDEA Section 618 data at the national level, IDEA Section 618 data at the State level, and the U.S. Department of Education's findings and determinations regarding the extent to which States are meeting the requirements of IDEA, Part B and Part C. The report also provides summaries of special education research conducted under Part E of the Education Sciences Reform Act of 2002, national special education studies and evaluations conducted under Section 664(a) and (c) of IDEA, and the extent and progress of the assessment of national activities, which focus on determining the effectiveness of IDEA and improving its implementation.