The Myanmar Army is the largest branch of the Armed Forces (Tatmadaw) of Myanmar and has the primary responsibility of conducting land-based military operations. The Myanmar Army maintains the second largest active force in Southeast Asia after the People's Army of Vietnam. It has clashed against ethnic and political insurgents since its inception in 1948.

The Tatmadaw or Sit-Tat is the military of Myanmar. It is administered by the Ministry of Defence and composed of the Myanmar Army, the Myanmar Navy and the Myanmar Air Force. Auxiliary services include the Myanmar Police Force, the Border Guard Forces, the Myanmar Coast Guard, and the People's Militia Units. Since independence in 1948, the Tatmadaw has faced significant ethnic insurgencies, especially in Chin, Kachin, Kayin, Kayah, and Shan states. General Ne Win took control of the country in a 1962 coup d'état, attempting to build an autarkic society called the Burmese Way to Socialism. Following the violent repression of nationwide protests in 1988, the military agreed to free elections in 1990, but ignored the resulting victory of the National League for Democracy and imprisoned its leader Aung San Suu Kyi. The 1990s also saw the escalation of the conflict involving Buddhists and Rohingya Muslims in Rakhine State due to RSO attacks on the Tatmadaw forces, which saw the Rohingya minority facing oppression and, starting in 2017, genocide.