Marian Simion (born 14 September 1975 in București) is a Romanian boxer, who competed in the Light Middleweight (71 kg) at the 2000 Summer Olympics and won the silver medal.

He repeated that feat one year later, at the 2001 World Amateur Boxing Championships in Belfast after having won the world title at the previous tournament in Houston, Texas, United States.

He is the older brother of Olympic boxer Dorel Simion.

His EU Amateur Championships medals include a gold in 2004, a silver in 1996 and bronze in 1998 and 2002.

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