The Monument to the Fallen for Spain (Spanish: Monumento a los Caídos por España) or the Monument to the Heroes of the Second of May (Monumento a los Héroes del Dos de Mayo), popularly known as el Obelisco ("the Obelisk"), is a war memorial in Madrid, Spain.

It is located at the Plaza de la Lealtad, between the Madrid Stock Exchange Building and the Ritz Hotel, next to the Paseo del Prado.

Standing close to 30 metres high,[1] the monument is built on the place where General Joachim Murat ordered the execution of numerous Spaniards after the Dos de Mayo Uprising of 1808.

On November 22, 1985, King Juan Carlos I re-inaugurated the monument as a memorial to all those who gave their life for Spain, including those who died in conflicts other than the Peninsular War.

This parallels other war memorials around the world of national symbolic importance, frequently known as the Tomb of the Unknown Soldier.