Hans-Jacob Emmanuel "Knubben" Mattsson (June 2, 1890 – December 1, 1980) was a Swedish ice hockey player who competed in the 1920 Summer Olympics. In 1920 he was a member of the Swedish National Team which finished fourth in the Summer Olympics tournament. He played two matches. Mattsson also played bandy. He was a member of the German Berliner Schlittschuhclub ice hockey team in 1919-20.
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