40th Group Army
Active	c.1949 – 2017
Country	People's Republic of China
Allegiance	Chinese Communist Party
Branch	People's Liberation Army Ground Force
Part of	People's Liberation Army
Garrison/HQ	Jinzhou, Liaoning
Commanders
Current commander	Zhang Xuefeng (张学锋)
Notable commanders	Han Xianchu

The 40th Group Army was a military formation of the People's Liberation Army, active in various forms from 1949 to 2017. It was last located in the Shenyang Military Region and the Northern Theater Command.

During the Korean War, the 40th Army was part of the People's Volunteer Army. It was composed of the 118th, 119th, and 120th Divisions.^[1]

In the morning of Oct. 25, the 118th Division of the 40th Army ambushed the 3rd Infantry Battalion of ROK 6th Division, destroying the ROK unit as an organized force.^{[citation needed]}

The 40th Army attacked the 9th and 38th Infantry Regiments of the U.S. 2nd Infantry Division about eighteen miles northeast of Kunu-ri along the Chongchon River.^[2]

In May 1989, the 40th Army's 118th Infantry Division and Artillery Brigade were deployed to Beijing to enforce martial law and suppress the 1989 Tiananmen Square protests.^{[3][better source needed]}