Romanian authorities launch one of the most violent pogroms in Jewish history in the city of Iași, resulting in the murder of at least 13,266 Jews.

The Kingdom of Romania, under the rule of King Carol II, initially maintained neutrality in World War II. However, fascist political forces, especially the Iron Guard, rose in popularity and power, urging an alliance with Nazi Germany and its allies. As the military fortunes of Romania's two main guarantors of territorial integrity—France and Britain—crumbled in the Battle of France, the government of Romania turned to Germany in hopes of a similar guarantee, unaware that Germany, in the supplementary protocol to the 1939 Molotov–Ribbentrop Pact, had already granted its blessing to Soviet claims on Romanian territory.

The Iași pogrom was a series of pogroms launched by governmental forces under Marshal and Leader Ion Antonescu in the Romanian city of Iași against its Jewish community, which lasted from 28 June to 30 June 1941. According to Romanian authorities, over 13,266 people, or one third of the Jewish population, were massacred in the pogrom itself or in its aftermath, and many were deported. It was one of the worst pogroms during World War II.

Iași, also sometimes referred historically as Jassy, is the third largest city in Romania and the seat of Iași County. Located in the historical region of Moldavia, it has traditionally been one of the leading centres of Romanian social, cultural, academic and artistic life. The city was the capital of the Principality of Moldavia from 1564 to 1859, then of the United Principalities from 1859 to 1862, and the capital of Romania from 1916 to 1918.