Bellon, 45, is replacing Patrick Espasa who was appointed Auchan president for Italy and Romania.
Espasa, 55, has been running Auchan Romania since 2009.
Auchan Romania completed in April the rebranding process of the 20 real hypermarkets it acquired last year from German group Metro.
Auchan Romania currently has 31 hypermarkets in Romania, two units under construction, a net sale area of 252.000 sqm, 11,000 employees, three logistics platforms and 70 million clients a year.