FB, Fb, or fb may refer to:
The FBI Ten Most Wanted Fugitives is a most wanted list maintained by the United States Federal Bureau of Investigation (FBI).
The FBI Most Wanted Terrorists was a list created and first released on October 10, 2001, with the authority of United States President Bush, following the September 11 attacks on the United States.
The PM-63 RAK (Often incorrectly referred to as Ręczny Automat Komandosów—"commandos' hand-held automatic"; the name itself means cancer or crayfish in Polish) is a Polish 9×18mm submachine gun, designed by Piotr Wilniewczyc in cooperation with Tadeusz Bednarski, Grzegorz Czubak and Marian Wakalski.
The FBI Seeking Terror Information list is the third major "wanted" list to have been created by the United States Department of Justice's Federal Bureau of Investigation to be used as a primary tool for publicly identifying and tracking down suspected terrorists operating against United States nationals at home and abroad.
The FBI's Ten Most Wanted Fugitives during the 2000s is a list, maintained for a sixth decade, of the Ten Most Wanted Fugitives of the United States' Federal Bureau of Investigation.
A major plotline on the fictional HBO drama The Sopranos was the U.S. Federal Bureau of Investigation's ongoing pursuit of the DiMeo (New Jersey) and Lupertazzi (Brooklyn) crime families.