Valley of Death (Polish: Dolina Śmierci) in Fordon, Bydgoszcz, northern Poland, is a site of Nazi German mass murder committed at the beginning of World War II and a mass grave of 1,200–1,400 Poles and Jews murdered in October and November 1939 by the local German Selbstschutz and the Gestapo.

It was part of a larger genocidal action that took place in all German occupied Poland, code-named Operation Tannenberg.

[4] Between September 1939 and April 1940 Selbstschutz - together with other Nazi-German formations - murdered tens of thousands of Poles in Pomerania.

[citation needed] Established investigations point to Ludolf von Alvensleben and Jakub Löllgen, as the main organizers of the mass murder.

Other Germans involved in the crime were: Sturmbannführers Erich Spaarmann, Meier, Schnugg, SS-Sturmbannführer dr Rudolf Tröger, SS man Baks, and a number of Volksdeutsche including Wilhelm Neumann, Herbert Beitsch, Otto Erlichmann (Nazi mayor of Fordon), and Walter Gassmann.