|Olympic medal record|
|Bronze||1912 Stockholm||6 metre class|
Otto Johann Aust (July 25, 1892 – October 12, 1943) was a Swedish sailor who competed in the 1912 Summer Olympics. He was born in Långedrag. He was part of the Swedish boat Kerstin, which won the bronze medal in the 6 metre class. He died at the age of 51 in Bremen, Germany.
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