Joseph Alzin (18 December 1893 – 2 September 1930) was a Luxembourgish weightlifter, competing at the Summer Olympics for Luxembourg in 1920 and the 1924 Summer Olympics.

[1] He was born in Paris, and died in Marseille.

He won the silver medal at the 1920 Olympics in the heavyweight (+82.5 kg) weightlifting.

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