Cayetano Redondo Aceña (7 August 1888 – 21 May 1940) was a Spanish politician, typographer, journalist and Esperantist.

[2] In 1918, Redondo was leader of the National Federation of Juventudes Socialistas, the youth wing of the Spanish Socialist Workers' Party (PSOE).

[2] After the start of the Spanish Civil War, at the height of the attacks and bombings carried by the Francoist faction on Madrid, Mayor Pedro Rico fled for Valencia hidden in a car boot.

[5] Redondo was elected his replacement on 8 November,[6] although the decisions of the Defence Council of Madrid largely determined the action of the municipal government.

[7][6] After Madrid fell, Redondo was captured by Francoist forces and executed by a firing squad at the walls of the Cementerio de la Almudena on 21 May 1940.