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The Shandong Problem or Shandong Question^[a] (simplified Chinese: 山东问题; traditional Chinese: 山東問題; pinyin: Shāndōng wèntí, Japanese: 山東問題, Santō mondai^[1]) was a dispute over Article 156 of the Treaty of Versailles in 1919, which dealt with the concession of the Shandong Peninsula. It was resolved in China's favor in 1922.

During the First World War (1914–1918), China supported the Allies on condition that the Kiautschou Bay Leased Territory on the Shandong peninsula, which had belonged to the German Empire prior to its occupation by Japan in 1914, would be returned to China. In 1915, however, China under President and later self-proclaimed Emperor Yuan Shikai reluctantly capitulated to thirteen of Japan's original Twenty-One Demands which, among other things, acknowledged Japanese control of former German holdings. Britain and France promised Japan it could keep these holdings. In late 1918, China's warlord Premier Duan Qirui secretly reaffirmed the transfer and accepted payments from Japan, causing a massive scandal after its exposure.^[2] Article 156 of the Treaty of Versailles transferred the territory of Kiautschou as well as the rights, titles and privileges acquired by virtue of the Sino-German treaty of 1898 to the Empire of Japan rather than return them to the Chinese administration.^[3]

The new government of China denounced the transfer of German holdings at the Paris Peace Conference in 1919, with the strong support of President Woodrow Wilson of the United States. The Chinese ambassador to the United States, Wellington Koo, stated that China could no more relinquish Shandong, which was the birthplace of Confucius, the greatest Chinese philosopher, than could Christians concede Jerusalem. He demanded the promised return of Shandong, but to no avail. Japan prevailed. Chinese popular outrage over Article 156 led to demonstrations on 4 May 1919 and a cultural movement known as the May Fourth Movement. As a result, Wellington Koo refused to sign the treaty.

The US, finding itself isolated by all Great Powers, agreed to the Japanese, British and French demands. The Chinese public became outraged by the eventual treaty, accusing the Chinese government of selling out, and became disappointed by Wilson's failed promises.^[4]

China's refusal to sign the Treaty of Versailles necessitated a separate peace treaty with Germany in 1921. The Shandong dispute was mediated by the United States in 1922 during the Washington Naval Conference. In a victory for China, the Japanese leasehold on Shandong was returned to China in the Nine-Power Treaty. Japan, however, maintained its economic dominance of the railway and the province as a whole.^[5] When its dominance in the province was threatened by the ongoing Northern Expedition to unite China in 1927–1928, Japan launched a series of military interventions, culminating in the Jinan incident conflict with Chinese Nationalist soldiers.