Army Day in Chile is celebrated every year on September 19. It is a national public holiday in the country and is a part of the week-long series of festivities known as Fiestas Patrias. The celebration is also known as 'Glories of the Army Day' or 'Dia de las Glorias del Ejército', in Spanish, and it commemorates the establishment of the Chilean Army.

The event is marked by a grand annual military parade that takes place in the capital city of Santiago. Thousands of military personnel, both in active duties and reserves, participate in this day-long parade. Veterans, cadets, and police forces also march down the streets of the city. This parade reflects the strong military tradition of Chile and its commitment to national defense.

In addition to the parade, Army Day is also celebrated with several patriotic events and military ceremonies across the country. These activities often include reenactments of historic battles, displays of military equipment and weaponry, and performances by military bands. Army Day serves as a special occasion for Chileans to honor and show respect for the dedication, service, and sacrifice of their military forces.