Yang Jingyu (traditional Chinese: 楊靖宇; simplified Chinese: 杨靖宇; pinyin: Yáng Jìngyǔ; February 13, 1905–February 23, 1940), born Ma Shangde (traditional Chinese: 馬尚德; simplified Chinese: 马尚德; pinyin: Mǎ Shàngdé, Xiao'erjing: ﻳْﺎ دٍ ﻳُﻮْ) in Queshan, Henan, was a Chinese Communist, commander-in-chief and political commissar of the First Route Army of the Northeast Anti-Japanese United Army, in the guerrilla war in Manchuria against the Japanese campaign to pacify Manchukuo during the Second Sino-Japanese War.
Yang joined the Chinese Communist Youth League in his home town in 1926, and joined the Communist Party of China in 1927. After the Autumn Harvest Uprising he organized local farmers in Queshan into a Revolutionary Armed Force unit. Later he did other underground work in Kaifeng and Luoyang.
In 1929, he was sent to northeast China, where he held the post of Communist Party of China Fushun special branch secretary. Imprisoned by the regime of Zhang Xueliang, he was rescued during the chaos following the Mukden Incident. After the rescue from prison, he successively held the offices of Harbin district party committee secretary, municipal party committee secretary, and Manchurian Acting provincial party committee secretary of the Central Military Commission.