CUSTRIN, a fortified town of Germany, in the Prussian province of Brandenburg, at the confluence of the Oder and Warthe, 18 m. N.E. from Frankfort-on-Oder and 51 m. N.E. of Berlin by rail. Pop. 21,274.
About 1250 a town was erected on the site of Ciistrin, where a fishing village originally stood. From 1535 till 1571 it was the residence of John, margrave of Brandenburg-Ciistrin, who died without male heirs in It consists of the town proper within the fortifications, a suburb on the left bank of the Oder, and one on the right bank of the Warthe. It has manufactories of machin ery, furniture, cigars, etc., and there is a considerable river trade.