于克河是德国的河流，流经勃兰登堡州和梅克伦堡-前波美拉尼亚州，最终注入什切青潟湖，河道全长102公里，流域面积2,200平方公里，平均流量每秒7.65立方米。

The Uecker ([ˈʏkər]) or Ucker is a river in the northeastern German states of Brandenburg, where it is known as the Ucker, and of Mecklenburg-Vorpommern. Its source lies in the Uckermark district, near the village Alt-Temmen. It flows north through Lake Oberuckersee, Lake Mollensee and Lake Unteruckersee, where the old town of Prenzlau stands. Near the small village of Nieden (the border between Brandenburg and Vorpommern) the Ucker changes its name to Uecker. It flows further north through the towns of Pasewalk and Torgelow, and passes Eggesin on the left site. Here the river Randow flows into the Uecker. In Ueckermünde, the Uecker flows into the Szczecin Lagoon, which connects with the Baltic Sea through the three straits Peenestrom, Świna and Dziwna.