Marco Siffredi (22 May 1979 – 8 September 2002) was a French snowboarder and mountaineer who hailed from a climbing family; his father was a mountain guide, and his brother had died in an avalanche in Chamonix.
Siffredi was the first to descend Mount Everest on a snowboard in 2001 via the Norton Couloir.
In 2002, he disappeared after making his second Everest summit, while attempting to snowboard the Hornbein Couloir.