The Federal Bureau of Narcotics (FBN) was an agency of the United States Department of the Treasury. Established in the Department of the Treasury by an act of June 14, 1930 consolidating the functions of the Federal Narcotics Control Board and the Narcotic Division. These older bureaus were established to assume enforcement responsibilities assigned to the Harrison Narcotics Tax Act, 1914 and the Narcotic Drugs Import and Export Act, 1922. (aka Jones-Miller Act)

Federal Bureau of Narcotics may refer to:

• Federal Bureau of Narcotics (United States), a United States federal law enforcement agency subsumed into the Bureau of Narcotics and Dangerous Drugs in 1968.
• Federal Bureau of Narcotics (Australia), an Australian Customs Service division (federal law enforcement agency) subsumed into the Australian Federal Police in 1979.