Bartenstein, a town of Germany, in the kingdom of Prussia, on the Alle, 34 m. S. of Königsberg by rail. Pop. (1900) 6805. It has a considerable trade in corn and live stock, and its industries comprise founding and carriage-building, tanneries, breweries and potteries. Bartenstein is celebrated for the treaty concluded here on the 26th of April 1807, between Prussia and Russia.