(16 February 1892 – 19 July 1966) was a Spanish Cardinal of the Roman Catholic Church who served as Prefect of the Vatican Library from 1936 to 1962, and was elevated to the cardinalate in 1962.

He furthered his studies from 1921 to 1923, attending the Athenaeum of St. Anselm in Rome and the Faculty of Palaeography and Archives in Freiburg.

He was made Titular Abbot of Santa Maria de Ripoll on 5 May 1950, receiving the traditional abbatial blessing from Cardinal Eugène-Gabriel-Gervais-Laurent Tisserant on 26 August 1951.

He received his episcopal consecration on the following 19 April from Pope John, with Cardinals Giuseppe Pizzardo and Benedetto Aloisi Masella serving as co-consecrators, in the Lateran Basilica.

From 1962 to 1965, he attended the Second Vatican Council, during the course of which he was one of the cardinal electors who participated in the 1963 papal conclave that elected Pope Paul VI.