Admiral Juan Bautista Aznar-Cabañas (5 September 1860 – 19 February 1933) was the Prime Minister of Spain from the resignation of Dámaso Berenguer y Fusté on to the deposition of King Alfonso XIII and the proclamation of the Spanish Second Republic on April 14, 1931.

After failing to reach an accommodation with them, and after the Republicans won the municipal elections, the constitutionalists recommended that the King vacate the country.

However, Admiral Aznar-Cabañas' casual comment: "Do you think it was a little thing what happened yesterday, that Spain went to bed as a monarchy and rose as a republic?"

became instantly famous, going quickly around Madrid and around Spain, calming public opinion and making the people and the military accept the fact.

Republicans within the Spanish Armed forces were a minority, but so were pro-monarchist reactionaries, the majority within the military were at first indifferent.