Otto Cordes (August 31, 1905 – December 24, 1970) was a German water polo player who competed in the 1928 Summer Olympics and in the 1932 Summer Olympics. In 1928 he was part of the German team which won the gold medal. He played all three match and scored one goal. Four years later he won the silver medal with the German team. He played all four matches. In 1968, his son, Burkhard Cordes, won a bronze medal in the 1968 Summer Olympics in sailing - class Flying Dutchman.