Theobald Theodor Friedrich Alfred von Bethmann Hollweg was a German politician who was Chancellor of the German Empire from 1909 to 1917. He oversaw the German entry into World War I and played a key role during its first three years. He was replaced as chancellor in July 1917 due in large part to opposition to his moderate policies by leaders in the military.

Germany entered into World War I on August 1, 1914, when it declared war on Russia. In accordance with its war plan, it ignored Russia and moved first against France–declaring war on August 3 and sending its main armies through Belgium to capture Paris from the north. The German invasion of Belgium caused Britain to declare war on Germany on August 4. Most of the main parties were now at war. In October 1914, Turkey joined the war on Germany's side, becoming part of the Central Powers. Italy, which was allied with Germany and Austria-Hungary before World War I, was neutral in 1914 before switching to the Allied side in May 1915.