The National Army of Colombia is the land warfare service branch of the Military Forces of Colombia. With over 361,420 active personnel as of 2020, it is the largest and oldest service branch in Colombia, and is the second largest army in the Americas after the United States and before the Brazil.

The Military Forces of Colombia are the unified armed forces of the Republic of Colombia. They consist of the Colombian Army, the Colombian Navy and the Colombian Aerospace Force. The National Police of Colombia, although technically not part of the military, is controlled and administered by the Ministry of National Defence, and national conscription also includes service in the National Police, thus making it a de facto gendarmerie and a branch of the military. The President of Colombia is the military's commander in chief, and helps formulate defense policy through the Ministry of National Defence, which is in charge of day-to-day operations.