Juan Antonio Ruiz-Casaux y Lopez de Carvajal, V. marqués de Atalaya Bermeja, usually known as Juan Ruiz Casaux (23 December 1889 – 16 January 1972) was a noted Spanish cellist and teacher. Along with Pablo Casals and Gaspar Cassadó, he was a member of the \"Three Cs\" of the Spanish cello.

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