William Bon Mardion (born 4 October 1983) is a French ski mountaineer.

Bon Mardion was born and lives in Arêches where he is member of the Club Multisports Arêches-Beaufort.

He started ski mountaineering in 1998.

He competed first as a member of the "Espoirs" team at the Pierra Menta race in the same year and has been member of the national team since 2006.

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