​KROTOSCHIN (in Polish, Krotoszyn), a town of Germany, in the Prussian province of Posen, 32 m. S.E. of Posen. Pop. (1900), 12,373. It has three churches, a synagogue, steam saw-mills, ​and a steam brewery, and carries on trade in grain and seeds. The castle of Krotoschin is the chief place of a mediatized principality which was formed in 1819 out of the domains of the Prussian crown and was granted to the prince of Thurn and Taxis in compensation for the relinquishment by him of the monopoly of the Prussian postal system, formerly held by his family.