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 founded by Chen Duxiu on 15 September 1915 in Shanghai. Its headquarters were moved to Beijing in January 1917 when Chen was appointed Chairman of the Chinese Literature Department 北大文学系. 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. The magazine published all vernacular 白话 beginning with the May 1918 issue, Volume 4, Number 5. It was a first.
Being influenced by the 1917 Russian October Revolution, La Jeunesse increasingly began to promote Marxism and its philosophy. The trend accelerated after the departure of Hu Shih who later became the Republic of China (non-communist) Education Minister. Beginning with the issue of September 1, 1920, La Jeunesse began to openly support the communism movement in Shanghai. And with the June 1923 issue, it became the official Chinese Communist Party theoretical journal. It was shut down in 1926 by the Nationalist Government. La Jeunesse influenced thousands of Chinese youngsters including many leaders of the Chinese Communist Party.