Stutthof was a Nazi concentration camp established by Nazi Germany in a secluded, marshy, and wooded area near the village of Stutthof (now Sztutowo) 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.

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.

Among the notable female guard personnel were: Elisabeth Becker, Erna Beilhardt, Ella Bergmann, Ella Blank, Gerda Bork, Herta Bothe, Erna Boettcher, Hermine Boettcher-Brueckner, Steffi Brillowski, Charlotte Graf, Charlotte Gregor, Charlotte Klein, Gerda Steinhoff, Ewa Paradies, and Jenny-Wanda Barkmann. Thirty-four female guards including Becker, Bothe, Steinhoff, Paradies, and Barkmann were identified later as having committed crimes against humanity. The SS in Stutthof began conscripting women from Danzig and the surrounding cities in June 1944, to train as camp guards because of their severe shortage after the women's subcamp of Stutthof called Bromberg-Ost (Konzentrationslager Bromberg-Ost) was set up in the city of Bydgoszcz.

Several Norwegian Waffen SS volunteers worked as guards or as instructors for prisoners from Nordic countries, according to senior researcher at the Norwegian Center for Studies of Holocaust and Religious Minorities, Terje Emberland.

The first 150 inmates, imprisoned on 2 September 1939, were selected among Poles and Jews arrested in Danzig immediately after the outbreak of war. The inmate population rose to 6,000 in the following two weeks, on 15 September 1939. Until 1942, nearly all of the prisoners were Polish. The number of inmates increased considerably in 1944, with Jews forming a significant proportion of the newcomers. The first contingent of 2,500 Jewish prisoners arrived from Auschwitz in July 1944. In total, 23,566 Jews (including 21,817 women) were transferred to Stutthof from Auschwitz, and 25,053 (including 16,123 women) from camps in the Baltic states. When the Soviet army began its advance through German-occupied Estonia in July and August 1944, the camp staff of Klooga concentration camp evacuated the majority of the inmates by sea and sent them to Stutthof. Other sources say that the camp staff shot most remaining inmates in a mass murder.

Stutthof's registered inmates included citizens of 28 countries, and besides Jews and Poles – Germans, Czechs, Dutch, Belgians, French, Norwegians, Finns, Danes, Lithuanians, Latvians, Belarusians, Russians, and others. Among 110,000 prisoners were Jews from all over Europe, members of the Polish underground, Polish civilians deported from Warsaw during the Warsaw Uprising, Lithuanian and Latvian intelligentsia, Latvian resistance fighters, psychiatric patients, Soviet prisoners of war, and Communists (as an example of Communist deportations to Stutthof, see the Danish Horserød camp). One prominent inmate and survivor of the Stutthof concentration camp was a member of parliament for the Communist Party of Denmark Martin Nielsen, who detailed his deportation to, experience in and ensuing death march from the camp in his book Rapport fra Stutthof ('Report from Stutthof'). It is believed that inmates sent for immediate execution were not registered.

Conditions in the camp were extremely harsh; tens of thousands of prisoners succumbed to starvation and disease. Many died in typhus epidemics that swept the camp in the winter of 1942 and again in 1944; those whom the SS guards judged too weak or sick to work were gassed in the camp's small gas chamber. The first executions were carried out on 11 January and 22 March 1940 – 89 Polish activists and government officials were shot. Gassing with Zyklon B began in June 1944. 4,000 prisoners, including Jewish women and children, were killed in a gas chamber before the evacuation of the camp. Another method of execution practiced in Stutthof was lethal injection of phenol. Prisoners were also drowned in mud or clubbed to death. Between 63,000 and 65,000 people died in the camp.

A range of German organisations and individuals used Stutthof prisoners as forced laborers. Many prisoners worked in SS-owned businesses such as DAW (Deutsche Ausrüstungswerke, literally the 'German Equipment Works'), the heavily guarded armaments factory located inside the camp next to prisoner barracks. Other inmates labored in local brickyards, in private industrial enterprises, in agriculture, or in the camp's own workshops. In 1944, as forced labor by concentration camp prisoners became increasingly important in armaments production, a Focke-Wulf aircraft factory was constructed at Stutthof. Eventually, the Stutthof camp system became a network of forced-labor camps. The Holocaust Encyclopedia estimates that (less officially) some 105 Stutthof subcamps were established throughout northern and central Poland. The major subcamps were in Toruń (Thorn) and in Elbląg (Elbing).

There was a controversy regarding whether corpses from Stutthof were used in the production of soap made from human corpses at the lab of Professor Rudolf Spanner.

Historian Joachim Neander argued that, contrary to some claims made in previous years, what the Institute of National Remembrance (IPN) calls the "chemical substance which was essentially soap" was the byproduct of Spanner's bone maceration processes done to create anatomical models at the Danzig Anatomical Institute, where he worked and which was not part of the Stutthof camp. The corpses used for this were not "harvested" bodies, and the byproduct of Spanner's work at the Danzig institute was collected. This was conflated with the separate debunked rumours of industrial production of human soap in concentration camps, which circulated during the war, and thereafter used as proof of this during the Nuremberg trials.

Polish historians and employees at the IPN, Monika Tomkiewicz and Piotr Semków, reached similar conclusions. Semków states that the presence of human fat tissue has been confirmed in the samples of soapy grease (claimed to be "unfinished soap") from Danzig presented during the trials through analysis performed by the IPN and Gdańsk University of Technology in 2011 and 2006, respectively, but his and Tomkiewicz research concluded that this was a byproduct stemming from Spanner's work in bone maceration at the institute unrelated to the Stutthof camp. Spanner was unlikely to have "really occupied himself with the production of usable soap from human fat", and that any soap production in his laboratory was likely marginal. It was also added that Spanner was arrested twice after the war but released after each time after explaining how he had conducted the maceration and injection process of his models and was declared "clean" by the denazification program in 1948, officially exonerated, and resumed his academic career.

The main German concentration camp in Stutthof had as many as 40 sub-camps during World War II. In total, the sub-camps held 110,000 prisoners from 25 countries. The sub-camps of Stutthof included:

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The camp had two commanders:

• SS-Sturmbannführer Max Pauly, September 1939 – August 1942
• SS-Sturmbannführer Paul-Werner Hoppe, August 1942 – January 1945

The evacuation of prisoners from the Stutthof camp system began on 25 January 1945. When the final evacuation began, there were nearly 50,000 prisoners, most of them Jews, in the Stutthof camp system. The prisoners were marched in the direction of Lauenburg in eastern Germany. Cut off by advancing Soviet forces, the Germans forced the surviving prisoners to march back to Stutthof.

In late April 1945, the remaining prisoners were removed from Stutthof by sea, since the camp was completely encircled by Soviet forces. Again, hundreds of prisoners were forced into the sea and shot. Over 4,000 were sent by small boat to Germany, some to the Neuengamme concentration camp near Hamburg, and some to camps along the Baltic coast.

On 5 May 1945, a barge full of starving prisoners was towed into harbour at Klintholm Havn in Denmark where 351 of the 370 on board were saved. Shortly before the German surrender, some prisoners were transferred to Malmö, Sweden, and released into the care of that neutral country. It has been estimated that around half of the evacuated prisoners, over 25,000, died during the evacuation from Stutthof and its subcamps.

Soviet forces liberated Stutthof on 9 May 1945, rescuing about 100 prisoners who had managed to hide.