Joseph Miaczinski or Józef Miączyński (1743/1751-1793) was a Polish-Lithuanian general (chef de brigade) who joined the French Army of the North on 25 July 1792, the day Brunswick Manifesto was published. He supported General Dumouriez, defending France against the Prussian and Austrian armies, occupying the Austrian Netherlands and the duchy of Limburg. Dumouriez, unsatisfied with the chaos in the Defence department caused by the Jacobins, preferred a constitutional monarchy. After Dumouriez's dismissal from the High Command, Miaczinski agreed to participate in the preparation of a military coup against the National Convention. In early April 1793, Miaczinsky was arrested, accused of criminal and counter-revolutionary activities, trialled, and executed.