The Bund Reichskriegsflagge (Imperial War Flag Society) or the Verband Reichskriegsflagge (Imperial War Flag Union) was a paramilitary organization founded by Ernst Röhm in 1923.
The Bund Reichskriegsflagge was formed from the local groups of Memmingen, Schleißheim, Augsburg and Munich of the Wehrverband Reichsflagge (Imperial Flag Combat League), which had previously been expelled for insubordination. The official leader was Joseph Seydel but Ernst Röhm was really in control. Political leadership was transferred to Adolf Hitler on September 25, 1923. It was part of the Kampfbund. The Bund Reichskriegsflagge under Ernst Röhm was instrumental in the Beer Hall Putsch—the unsuccessful attempt by Hitler and the Nazi Party (NSDAP) to seize power in Munich in November 1923. Both it and the NSDAP were banned afterwards. The Bund Reichskriegsflagge was briefly resurrected in 1925, then merged with the Tannenbergbund.