Bloodlands: Europe Between Hitler and Stalin is a 2010 book by Yale historian Timothy Snyder. It is about mass murders committed before and during World War II in territories controlled by Nazi Germany and the Soviet Union.

In this book, Snyder examines the political, cultural, and ideological context tied to a specific region of Central and Eastern Europe, where Joseph Stalin's Soviet Union and Adolf Hitler's Nazi Germany committed mass murders of an estimated 14 million noncombatants between 1933 and 1945, the majority outside the death camps of the Holocaust. Snyder's thesis delineates the "bloodlands" as a region that now comprises Poland, Belarus, Ukraine, the Baltic states (Estonia, Latvia, and Lithuania), northeastern Romania, and the westernmost fringes of Russia; in this region, Stalin and Hitler's regimes, despite their conflicting goals, interacted to increase suffering and bloodshed beyond what each regime would have inflicted independently.

Snyder draws similarities between the two totalitarian regimes and the enabling interactions that reinforced the destruction and suffering that they inflicted upon noncombatants. According to Anne Applebaum, "Snyder's book has a lot of information that people who know these subjects know very well. But what it does that is different and wholly original is show the ways that Hitler and Stalin echoed one another, at times working together and other times fighting one another. The way in which they egged each other on, acting as two facets of what was really the same phenomenon."

According to Snyder, "the Germans deliberately killed about 11 million noncombatants, a figure that rises to more than 12 million if foreseeable deaths from deportation, hunger, and sentences in concentration camps are included. For the Soviets during the Stalin period, the analogous figures are approximately 6 million and 9 million."

The book was awarded numerous prizes, including the 2013 Hannah Arendt Prize for Political Thought, and stirred up a great deal of debate among historians. Reviews ranged from highly critical to "rapturous".

The Central and Eastern European regions that Snyder terms "the bloodlands" is the area where Hitler's vision of racial supremacy and Lebensraum, resulting in the Final Solution and other Nazi atrocities, met, sometimes in conflict, sometimes in cooperation, with Stalin's vision of a communist ideology that resulted in the deliberate starvation, imprisonment, and murder of innocent men, women and children in Gulags and elsewhere.

The combined efforts of the two regimes resulted in the deaths of an estimated 14 million noncombatants in the Eastern European "Bloodlands"; Snyder documents that Nazi Germany was responsible for about two thirds of the total number of deaths. At least 5.4 million died in what has become known as the Holocaust, but many more died in more obscure circumstances.

Snyder seeks to show that interaction between the Nazi and Soviet regimes is crucial to telling the story of this bloodshed. He posits that early Soviet support for the Warsaw Uprising against the Nazi occupation was followed by an unwillingness to aid the uprising because the Soviets were willing to have the Nazis eliminate potential sources of resistance to a later Soviet occupation. Snyder states that this is one example of an interaction that led to many more deaths than might have been the case if each regime had been acting independently.