Thiếu Sơn (1908–1978), birth name Lê Sĩ Quý, was a Vietnamese writer, journalist, literary critic and revolutionary. As a literary critics, he was known for his magnum opus Phê bình và cảo luận (Criticism and rough dissertation) (1933). He was considered the pioneer of literary criticism using the Vietnamese alphabet, and also pioneer of . During the Indochina War and Vietnam War, he worked as a leftist activist who supported the resistance effort of Democratic Republic of Vietnam against the invasion of France and United States.