Harald Sigfrid Alexander Julin (27 March 1890 – 31 July 1967) was a Swedish swimmer and water polo player who competed at the 1906, 1908, 1912 and 1920 Olympics.

In water polo he won bronze medals in 1908 and 1920 and a silver at the 1912 Summer Olympics in his native Stockholm.

His sons Åke and Rolf also became Olympic water polo players.

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You can help Wikipedia by expanding it.This biographical article relating to a Swedish water polo figure is a stub.