The Leniwka (Polish pronunciation: [lɛˈɲifka]) is the former name of the western branch of the Vistula (now Vistula) in northern Poland. It is 55.4 kilometres (34.4 mi) long, and flows into Gdańsk Bay, forming the borders of Sobieszewo Island. It begins behind the lock in Biała Góra, where the Nogat, the eastern branch, also begins. The current Martwa Wisła is part of Leniwka.
Towns and villages on the Leniwka: