Stutthof was a Nazi concentration camp established by Nazi Germany in a secluded, marshy, and wooded area near the village of Stutthof (now Sztutowo, Pomeranian Voivodeship of northern Poland) 34 km (21 mi) east of the city of Danzig (Gdańsk) in the territory of the German-annexed Free City of Danzig. The camp was set up around existing structures after the invasion of Poland in World War II and initially used for the imprisonment of Polish leaders and intelligentsia. The actual barracks were built the following year by prisoners. Most of the infrastructure of the concentration camp was either destroyed or dismantled shortly after the war. In 1962, the former concentration camp with its remaining structures was turned into a memorial museum.

Stutthof was the first German concentration camp set up outside German borders in World War II, in operation from 2 September 1939. It was also the last camp liberated by the Allies, on 9 May 1945. It is estimated that between 63,000 and 65,000 prisoners of Stutthof concentration camp and its subcamps died as a result of murder, starvation, epidemics, extreme labour conditions, brutal and forced evacuations, and a lack of medical attention. Some 28,000 of those who died were Jews. In total, as many as 110,000 people were deported to the camp in the course of its existence. About 24,600 were transferred from Stutthof to other locations.

The camp was established in connection with the ethnic cleansing project that included the liquidation of Polish elites (members of the intelligentsia, religious and political leaders) in the Danzig area and Western Prussia.

Even before the war began, the German Selbstschutz in Pomerania created lists of people to be arrested, and the Nazi authorities were secretly reviewing suitable places to set up concentration camps in their area.

Originally, Stutthof was a civilian internment camp under the Danzig police chief, before its subsequent massive expansion. In November 1941, it became a "labor education" camp (like Dachau), administered by the German Security Police. Finally, in January 1942, Stutthof became a regular concentration camp.

The original camp (known as the old camp) was surrounded by the barbed-wire fence. It comprised eight barracks for the inmates and a "Kommandantur" for the SS guards, totaling 120,000 square metres (1,300,000 sq ft). In 1943, the camp was enlarged and a new camp was constructed alongside the earlier one. It was also surrounded by electrified barbed-wire fence and contained thirty new barracks, raising the total area to 1.2 square kilometres (0.46 sq mi). A crematorium and gas chamber were added in 1943, just in time to start mass executions when Stutthof was included in the "Final Solution" in June 1944. Mobile gas wagons were also used to complement the maximum capacity of the gas chamber (150 people per execution) when needed.^{[citation needed]}

The camp staff consisted of German SS guards and, after 1943, the Ukrainian auxiliaries brought in by SS-Gruppenführer Fritz Katzmann, the Higher SS and Police Leader of the area.

In 1942 the first German female SS Aufseherinnen guards arrived at Stutthof along with female prisoners. A total of 295 women guards worked as staff in the Stutthof complex of camps.