Chen Duxiu (; October 8, 1879 – May 27, 1942) was a Chinese revolutionary socialist, educator, philosopher, and author, who co-founded the Chinese Communist Party (with Li Dazhao) in 1921, serving from 1921 to 1927 as its first General Secretary. Chen was a leading figure in the anti-imperial Xinhai Revolution and the May Fourth Movement for Science and Democracy. Politically, he advocated the Trotskyist theory of Marxism.