FBU (Romanian: Frăția Blocurilor Unite – FBU; English: Brotherhood of the United Blocks) is a Romanian micronation founded on 22 April 2009. Even if is founded in Romania, FBU territory is mainly on minecraft. 

FBU is a democratic state with a unitary system of governance. The actual form of government is a constitutional monarchy with a parliamentary system. FBU doesn't have a written Constitution, but it works on customs and the principles of democracy.