美国陆军航空军（United States Army Air Forces，缩写为USAAF），美国空军的前身。1941年由美国陆军航空兵团（United States Army Air Corps, USAAC）改组而成。第二次世界大战期间，为世界上规模最大的军事航空部队。在1944年的全盛时期，拥有编制240万员、近8万架飞机及783个永久基地。

1941年，原陆军航空军司令兼陆军副参谋长亨利·阿诺德任陆军航空军首任司令（Chief of Army Air Forces）。在1942年3月9日的军事改组中，陆军航空部队、陆军地面部队、陆军后勤部队成为美国陆军三大组成部分。阿诺德任改组后陆军航空军司令（Commanding General, Army Air Forces）。1944年，阿诺德晋五星上将。1946年，卡尔·史帕兹继任为陆军航空军司令。

The United States Army Air Forces (USAAF or AAF) were the military aviation service of the United States of America during and immediately after World War II, successor to the United States Army Air Corps and the direct predecessor of the United States Air Force. The AAF were a component of the United States Army, which in 1942 was divided functionally by executive order into three autonomous forces: the Army Ground Forces, the Services of Supply (which in 1943 became the Army Service Forces), and the Army Air Forces. Each of these forces had a commanding general who reported directly to the Army Chief of Staff.