Manuel Dionysios Díaz Martínez (April 8, 1874 – February 20, 1929) was a Cuban fencer who competed in the 1904 Summer Olympics.

He was born in Havana and died in Rochester, Minnesota.

[1] In 1904 he won the gold medal in the individual sabre and team foil competition.

[3] This article about a Cuban Olympic medalist is a stub.

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