Johan Harald Alfred Wallin (27 February 1887 – 16 June 1946) was a Swedish sailor who competed at the 1908 and 1912 Summer Olympics.

[1][2] In 1908, he was a crew member of the Swedish boat Vinga, which won the silver medal in the 8 metre class.

Four years later, he was a crew member of the Swedish boat Kitty which won the gold medal in the 10 metre class.

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