The Laotian Civil War (1959–1975) was a civil war in Laos waged between the Communist Pathet Lao and the Royal Lao Government from 23 May 1959 to 2 December 1975. It is associated with the Cambodian Civil War and the Vietnam War, with both sides receiving heavy external support in a proxy war between the global Cold War superpowers. It is known as the Secret War among the American CIA Special Activities Center, and Hmong and Mien veterans of the conflict.

The Pathet Lao, officially the Lao People's Liberation Army, was a communist political movement and organization in Laos, formed in the mid-20th century. The group ultimately conquered the entire country in 1975, after the Laotian Civil War. The Pathet Lao were always closely associated with Vietnamese communists and North Vietnam. During the civil war, it was effectively organized, equipped and even led by the People's Army of Vietnam (PAVN). They fought against the anti-communist forces in the Vietnam War. Eventually, the term became the generic name for Laotian communists. Under orders from Mao Zedong, the People's Liberation Army provided 115,000 guns, 920,000 grenades and 170 million bullets, and trained more than 700 of its military officers.