The Hase is a 169.7-kilometre-long (105.4 mi) river of Lower Saxony, Germany.

[1] It is a right tributary of the Ems, but part of its flow goes to the Else, that is part of the Weser basin.

Its source is in the Teutoburg Forest, south-east of Osnabrück, on the north slope of the 307-metre-high (1,007 ft) Hankenüll hill.

After about 15 kilometres (9 mi), near Gesmold and about 6 kilometres (4 mi) west of Melle, the Hase encounters an anomaly of terrain and bifurcates such that each branch flows in a different drainage system: Currently one Run-of-the-river hydroelectricity is installed Media related to Hase at Wikimedia Commons