​KOESFELD, a town of Germany, in the Prussian province of Westphalia, on the Berkel, 38 m. by rail N.N.W. of Dortmund. Pop. (1905), 8449. It has three Roman Catholic churches, one of which—the Gymnasial Kirche—is used by the Protestant community. Here are the ruins of the Ludgeri Castle, formerly the residence of the bishops of Münster, and also the castle of Varlar, the residence of the princes of Salm-Horstmar. The leading industries include the making of linen goods and machinery.