Santiago Casares y Quiroga (8 May 1884, in A Coruña, Galicia – 17 February 1950, in Paris) was Prime Minister of Spain from 13 May to 19 July 1936.

Casares Quiroga resigned just 48 hours after the beginning of the military insurrection that led to the Spanish Civil War.

He was serving as prime minister when the military conspiracy and then uprising of 17 July 1936 took place, which then developed into the Spanish Civil War.

Incapable of confronting the rebellion, Casares resigned on 19 July and was replaced by Diego Martínez Barrio, whose government was never confirmed, and then definitely by José Giral.

[5] Historians have generally agreed that Casares refused to deliver arms to the revolutionary workers’ organizations as the right-wing uprising unfolded.