Schools funded by the Bureau of Indian Education (BIE) are required under the Individuals with Disabilities Education Act (IDEA) to provide services for eligible students with disabilities, such as learning disabilities or health impairments. Services for these students are listed in individualized education programs (IEP). The Department of Education has raised concerns about BIE's implementation of IDEA in recent years, including its long-standing noncompliance with IDEA requirements. The Government Accountability Office (GAO) was asked to examine the provision of special education and related services to eligible BIE students. This report examines the extent to which: (1) BIE students with disabilities are provided the special education and related services required by their IEPs; and (2) BIE oversees and supports the provision of special education at its schools. GAO analyzed data on special education and related services for a generalizable sample of 138 BIE students with IEPs at 30 schools over a 4-month period in school year 2017-2018 (the most recent complete school year at the time of our analysis); compared BIE special education practices with its policies and Interior and IDEA requirements; visited schools in two states selected for their large numbers of BIE schools; and interviewed school and agency officials. GAO is making seven recommendations, including that BIE establish consistent requirements for schools on making up missed services, annually verify special education services at all schools, comply with high-risk monitoring and technical assistance requirements, and ensure that BIE staff receive needed training.