Joaquim Mascarenhas de Fiúza (8 February 1908 – 4 March 2010) was a Portuguese sailor who competed in three Olympic games in 1936, 1948 and 1952.

At the Berlin Games he was placed 10th in the men's Star class sailing competition, alongside António de Herédia.

In London he improved his performance to 6th in the same event, alongside Júlio Gourinho.

In Helsinki, he won the bronze medal in the event alongside Francisco de Andrade.

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