Natascia Leonardi Cortesi (born 1 May 1971) is a Swisscross-country skier and ski mountaineer who has competed since 1988 in the World Cup circuit. She won a bronze medal in the 4 × 5 km relay at the 2002 Winter Olympics in Salt Lake City and had her best individual finish with a tenth place in the 30 km event at those same games. This was the first olympic medal ever for a Swiss woman cross-country team. Leonardi Cortesi's best score at the FIS Nordic World Ski Championships was a fifth place in the 4 × 5 km relay in 1999.
At the Worldloppet she won three times her home-race the Engadin Skimarathon in 2003, 2005 and 2006. She was the first Swiss woman to win the Kangaroo Hoppet 2006 in Australia and 2011 the Transjurassienne in France.