La Jeunesse, or New Youth (Chinese: 新青年; pinyin: Xīn Qīngnián) was an influential Chinese magazine in the 1910s and 1920s that played an important role in initiating the New Culture Movement and spreading the influence of the May Fourth Movement.
The magazine was started by Chen Duxiu on 15 September 1915 in Shanghai. Its headquarters were moved to Beijing in January 1917. Editors included Chen Duxiu, Qian Xuantong, Gao Yihan, Hu Shih, Li Dazhao, Shen Yinmo, and Lu Xun. It initiated the New Culture Movement, promoting science, democracy, and Vernacular Chinese literature.
Being influenced by the 1917 Russian October Revolution, La Jeunesse also began to promote Marxism and its philosophy. From September 1920, La Jeunesse began to support the Communist Party of China. It was shut down in 1926. In the early days, La Jeunesse had influenced thousands of Chinese youngsters including many leaders of the Chinese Communist Party.
A Japanese version of the magazine using the same kanji (shinseinen) began in 1920 and ran through 1950. The organ became a sort of unofficial propaganda for the Japanese Imperial forces during WWII. It is widely known for both its detective fiction and war stories.