The Angrapa (Russian: Анграпа, Polish: Węgorapa, German: Angerapp, Lithuanian: Angrapė) is a river that begins in northeastern Poland and ends in the Kaliningrad Oblast of Russia.

Originating in Lake Mamry, it joins the 101-km-long Instruch at a point near Chernyakhovsk – variously assessed as lying 140,[1] 169,[2] or 172 km[3] from its source – to form the Pregolya.

The name Angrapa is derived from the Old Prussian words anguris (eel) and apis (river).

The towns of Węgorzewo, Ozyorsk and Chernyakhovsk as well as the village of Mayakovskoye, are situated along the course of the Angrapa.

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