The National Background Investigations Bureau (NBIB) is the primary service provider of government-wide background investigations for the Federal Government with the mission of delivering efficient and effective background investigations to ensure the integrity and trustworthiness of the Federal workforce.

NBIB has the responsibility of conducting background investigations for over 100 Federal agencies — approximately 95% of the total background investigations government-wide. Subsuming the existing mission, authorities and staff of the former Federal Investigative Service (FIS), the NBIB was stood up without interruption to the crucially important investigative services OPM is tasked with providing. In addition, the NBIB provides investigative systems training and conducts oversight evaluations of other agencies to review compliance with Federal security regulations.

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