"They shall not pass" (French: "Ils ne passeront pas"), (Spanish "¡NO PASARAN!") is a propaganda slogan used to express determination to defend a position against an enemy. It was most famously used during the Battle of Verdun in World War I by General Robert Nivelle, and was used again in the defense of Madrid during the Spanish Civil War by Dolores Ibárruri Gómez ("La Pasionaria"), Communist orator and one of the founders of the Communist Party of Spain.

The phrase has been used as recently as December 2002 by Colonel Emmanual Maurin , commanding a French Foreign Legion unit in Côte d'Ivoire.