The Bauer cabinet (German: Kabinett Bauer) was the second democratically elected Reichsregierung of the German Reich. It was named after Reichsministerpräsident (head of government) Gustav Bauer and took office on 21 June 1919 when it replaced the Cabinet Scheidemann. Although the Weimar Constitution was not in force yet, it is generally counted as the second government of the Weimar Republic.
It was initially based on a coalition of the Social Democratic Party of Germany (SPD) and the Zentrum. The German Democratic Party (DDP) had refused to support signing the Treaty of Versailles, over which the Scheidemann Cabinet had resigned on 20 June 1919. The DDP rejoined the Cabinet Bauer on 3 October 1919, thus restoring the original Weimar Coalition of centre-left parties. The Cabinet Bauer resigned on 27 March 1920 as a result of the Kapp-Lüttwitz Putsch and was followed by the government of Hermann Müller.
The government of Gustav Bauer was created under great time pressure and under extraordinary circumstances. Early on 20 June 1919, the government of Philipp Scheidemann resigned since it was unable to agree on a common stance towards the Allied ultimatum to sign the Treaty of Versailles or face a resumption of hostilities. Germany had less than five days to accept. A refusal to sign was widely feared to result in the dismemberment of the German state, occupation by foreign troops and a possible plunge into the chaos of civil war.
At a loss of how to proceed, the Cabinet Scheidemann had seriously considered handing over supreme authority over the Reich to the Allies. It had been unprepared for the complete refusal of the Allies to negotiate the Treaty's terms. After its resignation, it fell to president Friedrich Ebert and the majority parties of the Weimar National Assembly to create a new government and to decide whether to sign the Treaty. Out of this crisis emerged the Cabinet Bauer.