The Pasłęka (German: Passarge; Lithuanian: Pasargė) is a river in northern Poland that debouches into the Baltic Sea on the Vistula Lagoon near Braniewo.

The reported length of the river varies, depending on sources, from[1] 169 to 211 kilometres (105 to 131 mi).

The drainage area of Pasłęka spreads over 2,330 square kilometres (900 sq mi).

[3] The historic Polish name Pasłęka was officially confirmed following World War II in 1949, replacing the former German name Passarge.

Several hydro plants are built on the river: Pasłęka crosses the following lakes: Wymój, Sarąg, Łęguty, Isąg.