The Prussian scheme is the name of a reported 1786 attempt by Nathaniel Gorham, acting in possible concert with other persons influential in the government of the United States, to establish a monarchy in the U.S. under the rule of Henry of Prussia, a prince of the House of Hohenzollern, possibly to resolve the ongoing political crises occurring during the last days of the Articles of Confederation. The attempt may have died due to a lack of interest on Henry's part, popular opposition to a rumored proposal involving a different potential monarch, the convening of the Philadelphia Convention, or some combination thereof.
The protracted disturbances created by the shortcomings of the Articles of Confederation as the United States' constitution, which culminated in Shays' Rebellion, reportedly gave rise to a "class of men in the community who gave very serious apprehensions to the advocates for a Republican form of government". Prior to, and following, the May 1787 convening of the Philadelphia Convention, widely circulated rumors reported that the conclave was meeting for the purpose of offering to enthrone Prince Frederick, Duke of York and Albany as king of the United States. So acute were the rumors that the convention issued a public denial that any proposal for a reestablishment of monarchy was being considered, the denial later being repeated in a letter sent by Alexander Martin to the governor of North Carolina.
American public opinion at the time generally regarded Prussia warmly. Prince Henry's older brother, Frederick the Great, harbored an "immense hatred" toward Britain. During the American Revolution, he had closed Prussian territory to passage by the army of the Principality of Anhalt-Zerbst, a British ally. This required military forces from the landlocked nation to make a circuitous journey to reach a seaport for deployment to North America, during which nearly half of Anhalt-Zerbst troops deserted. Similar restrictions were placed on troops from other British allies attempting to transit to North America, including the Principality of Bayreuth, the Margraviate of Ansbach, and the Landgraviate of Hesse-Kassel.