July 1934 in Europe

The Night of the Long Knives (German: Nacht der langen Messer, ), also called the Röhm purge or Operation Hummingbird (German: Unternehmen Kolibri), was a purge that took place in Nazi Germany from 30 June to 2 July 1934. Chancellor Adolf Hitler, urged on by Hermann Göring and Heinrich Himmler, ordered a series of political extrajudicial executions intended to consolidate his power and alleviate the concerns of the German military about the role of Ernst Röhm and the Sturmabteilung (SA), the Nazis' paramilitary organization, known colloquially as "Brownshirts". Nazi propaganda presented the murders as a preventive measure against an alleged imminent coup by the SA under Röhm – the so-called Röhm Putsch.

The 1934 Thrace pogroms (Turkish: Trakya Olayları, "Thrace incidents" or "Thrace events", Ladino: Furtuna/La Furtuna, "Storm") were a series of violent attacks against Jewish citizens of Turkey in June and July 1934 in the Thrace region of Turkey. One of the main crucial factors behind the events was the Resettlement Law passed by the Turkish Assembly on 14 June 1934.

Polish flood of 1934 (Polish: Powódź w Polsce, 1934) was the biggest flood in the Second Polish Republic. It began with heavy rains in the Dunajec river basin, which took place between 13 and 17 July 1934. In the following days, the flood spread to the basins of the Raba, Wisłoka, and Skawa, all of which are tributaries to the Vistula. The disaster took the lives of 55 people and caused damages estimated at 60 million interbellum zlotys.