The Treaty of Dortmund, or Dortmund Recess, was an agreement that was concluded on 10 June 1609 between representatives of Elector Johann Sigismund of Brandenburg and Wolfgang Wilhelm of Palatinate-Neuburg with regard to the succession of the United Duchies of Julich-Cleves-Berg through the mediation of Landgrave Maurice of Hesse-Kassel. It took place in the city of Dortmund.