The National Bureau of Criminal Investigation (NBCI), (Irish: An Biúró Náisiúnta um Imscrúdú Coiriúil) is a branch of Ireland's national police force, An Garda Síochána. It investigates serious crime throughout the country.
The Bureau was formed in 1997 from other small investigative branches around the country. Since then its main roles have been the investigation of murder, car theft, organised crime, sexual assault, art theft and other serious crimes. The NBCI is often called in to assist local detectives deal with serious crimes.