Sylvain Marconnet (born 8 April 1976 in Givors, Rhône) is a French rugby union footballer, currently playing for Biarritz Olympique having signed from Stade Français in the Top 14 club competition in France. His usual position is prop. Marconnet has played for France, including representing them at the 2003 Rugby World Cup in Australia.He made his debut for Stade Français during the 1997-98 season, which was also the year that they were crowned champions of France.