The end of World War II in Europe occurred in May 1945. Following the suicide of Adolf Hitler on 30 April, leadership of Nazi Germany passed to Grand Admiral Karl Dönitz and the Flensburg Government. Soviet troops captured Berlin on 2 May, and a number of German military forces surrendered over the next few days. On 8 May, Field Marshal Wilhelm Keitel signed the German Instrument of Surrender, an unconditional surrender to the Allies, in Karlshorst, Berlin. This is celebrated as Victory in Europe Day, while in Russia, 9 May is celebrated as Victory Day.

Some fighting continued after the German surrender. Some battles continued on the Eastern Front such as the Courland Pocket in western Latvia surrendering on 10 May, and the Prague offensive in Czechoslovakia ending on 11 May. On 25 May 1945, the Battle of Odžak ended in a Yugoslav Partisan victory. Following the conclusion in the European theatre, with the war continuing in the Pacific theatre.

Allied forces begin to take large numbers of Axis prisoners: The total number of prisoners taken on the Western Front in April 1945 by the Western Allies was 1,500,000. April also witnessed the capture of at least 120,000 German troops by the Western Allies in the last campaign of the war in Italy. In the three to four months up to the end of April, over 800,000 German soldiers surrendered on the Eastern Front. In early April, the first Allied-governed Rheinwiesenlager camps were established in western Germany to hold hundreds of thousands of captured or surrendered Axis Forces personnel. Supreme Headquarters Allied Expeditionary Force (SHAEF) reclassified all prisoners as Disarmed Enemy Forces, not POWs (prisoners of war). The legal fiction circumvented provisions under the Geneva Convention of 1929 on the treatment of former combatants. By October, thousands had died in the camps from starvation, exposure and disease.

Liberation of Nazi concentration camps and refugees: Allied forces began to discover the scale of the Holocaust, confirming the findings of Pilecki's 1943 Report. The advance into Germany uncovered numerous Nazi concentration camps and forced labour facilities. Up to 60,000 prisoners were at Bergen-Belsen when it was liberated on 15 April 1945, by the British 11th Armoured Division. Four days later troops from the American 42nd Infantry Division found Dachau. Allied troops forced the remaining SS guards to gather up the corpses and place them in mass graves. Due to the prisoners' poor physical condition, thousands continued to die after liberation. Captured SS guards were subsequently tried at Allied war crime tribunals where many were sentenced to death. Some Nazi guards and personnel were killed outright upon the discovery of their crimes. However, up to 10,000 Nazi war criminals eventually fled Europe using ratlines.

German forces withdraw from Finland: On 25 April 1945, the last German troops withdrew from Finnish Lapland and made their way into occupied Norway. On 27 April 1945, the Raising the Flag on the Three-Country Cairn photograph was taken.

Mussolini is executed: On 25 April 1945, Italian partisans liberated Milan and Turin. On 27 April 1945, as Allied forces closed in on Milan, Italian dictator Benito Mussolini was captured by Italian partisans. It is disputed whether he was trying to flee from Italy to Switzerland (through the Splügen Pass), and was travelling with a German anti-aircraft battalion. On 28 April, Mussolini was executed in Giulino (a civil parish of Mezzegra); the other fascists captured with him were taken to Dongo and executed there. The bodies were then taken to Milan and hung up on the Piazzale Loreto of the city. On 29 April, Rodolfo Graziani surrendered all Fascist Italian armed forces at Caserta. This included Army Group Liguria. Graziani was the Minister of Defence for Mussolini's Italian Social Republic.

Hitler commits suicide: On 30 April 1945, as the Battle of Nuremberg and the Battle of Hamburg ended with American and British occupation, the Battle in Berlin was still raging. With the Soviets surrounding Berlin and his escape route cut off by the Americans, German dictator Adolf Hitler, realizing that all was lost and not wishing to suffer Mussolini's fate, committed suicide in his Führerbunker along with his long-term partner Eva Braun, whom he had married less than 40 hours earlier. In his will, Hitler dismissed Reichsmarschall Hermann Göring, his second-in-command, and Interior minister Heinrich Himmler after each of them separately tried to seize control of the crumbling remains of Nazi Germany. Hitler appointed his successors as follows; Großadmiral Karl Dönitz as the new Reichspräsident ("President of Germany") and Joseph Goebbels as the new Reichskanzler (Chancellor of Germany). However, Goebbels died by suicide the next day, leaving Dönitz as the sole leader of Germany.

German forces in Italy surrender: On 29 April, the day before Hitler died, Oberstleutnant Schweinitz and Sturmbannführer Wenner, plenipotentiaries for Generaloberst Heinrich von Vietinghoff and SS Obergruppenführer Karl Wolff, signed a surrender document at Caserta after prolonged unauthorised secret negotiations with the Western Allies, which were viewed with great suspicion by the Soviet Union as trying to reach a separate peace. In the document, the Germans agreed to a ceasefire and surrender of all the forces under the command of Vietinghoff on 2 May at 2 pm. Accordingly, after some bitter wrangling between Wolff and Albert Kesselring in the early hours of 2 May, nearly 1,000,000 men in Italy and Austria surrendered unconditionally to British Field Marshal Sir Harold Alexander on 2 May at 2 pm.