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