Bureau of Indian Affairs Police

The Bureau of Indian Affairs Police, Office of Justice Services (BIA or BIA-OJS), also known as BIA Police, is the law enforcement arm of the United States Bureau of Indian Affairs. The BIA's official mission is to "uphold the constitutional sovereignty of the federally recognized tribes and preserve peace within Indian country". It provides police, investigative, corrections, technical assistance, and court services across the over 567 registered Indian tribes and reservations, especially those lacking their own police force; additionally, it oversees tribal police organizations. BIA services are provided through the Office of Justice Services Division of Law Enforcement.

In 2004 the agency employed 320 officers.

BIA Police are federal police officers who enforce all federal laws relating to Indian country, including Title 16 (conservation) Title 18 (criminal law and procedure) and Title 21 (food and drugs) of the United States Code, as well as the Code of Federal Regulations. The BIA has nationwide jurisdiction over crimes committed within or involving Indian Country, and its officers are usually based near Indian reservations. BIA Police officers may enforce tribal law if deputized by the tribe or provided for by tribal ordinance or statute. They may also be granted authority to enforce state laws by state statute.

The BIA has hiring preferences for Native Americans, but will hire non members who have the proper qualifications or educational requirements.