Raúl Casal Ribeiro Velazco (14 August 1887 – 1956) was a Paraguayan politician; he was vice president of Paraguay between 1932 and 1936, during Eusebio Ayala's government.

His father, Joaquín Casal-Ribeiro, was a Brazilian naval officer who participated in the Paraguayan War and later immigrated to Paraguay,[1] and his mother, Elodia Velazco, was Uruguayan.

He had an active life in the student movement as he studied law in the Universidad Nacional de Asunción, wrote for various newspapers and joined the Liberal Party in his youth.

These eventually led to the Chaco War (1932-1935), a conflict which closely matched his term as vice president of Paraguay; he was Eusebio Ayala's running mate.

In 1940, when dictator Higinio Morínigo took power, he once again left the country, heading to Argentina, where he resided until 1952, when he finally returned to Paraguay during his friend Federico Chaves's presidency.