Luz Ardiden is a ski resort in the Pyrenees. It is situated in the Hautes-Pyrénées department, in the Midi-Pyrénées. The ski resort, which lies at a height of 1720 meters, opened on January 16, 1975. In more recent times, the road to Luz Ardiden has served as an occasional stage finish in Tour de France.

Starting from Luz-Saint-Sauveur (710 m.), the climb to Luz Ardiden (1720 m.) is 14.7 km long. Over this distance, the climb is 1010 m. (an average of 6.9%). The maximum gradient is 10%.

Luz Ardiden has been the finish-line for a Tour de France stage several times.

On the 2003 Tour de France, Lance Armstrong was riding with Iban Mayo at the start of the climb to Luz Ardiden when Armstrong crashed, bringing Mayo down with him. The fall was caused when Armstrong caught the handlebar of his bike on the strap of a spectator's bag. Jan Ulrich, who was riding just behind Armstrong and Mayo, avoided the crash, and in an act of chivalry he slowed to wait for the fallen riders. Armstrong quickly re-mounted his bike and caught Jan Ulrich. Immediately, Armstrong attacked the group of riders, none of whom could follow him and he powered his way to win the stage by 40 seconds, on his way to a victory on the Champs Elysees by 1 minute 1 second.

Lance Edward Armstrong (born Lance Edward Gunderson on September 18, 1971) is an American former professional road racing cyclist who won the Tour de France a record seven consecutive times after having survived testicular cancer. He is also the founder and chairman of the Lance Armstrong Foundation for cancer research and support. He last rode for UCI ProTeam Team RadioShack, a team he helped found.

In October 1996 he was diagnosed as having testicular cancer with a tumor that had metastasized to his brain and lungs. His cancer treatments included brain and testicular surgery and extensive chemotherapy, and his prognosis was originally poor. He went on to win the Tour de France each year from 1999 to 2005, and is the only person to win seven times having broken the previous record of five wins shared by Miguel Indurain, Bernard Hinault, Eddy Merckx, and Jacques Anquetil.

In 1999, he was named the ABC Wide World of Sports Athlete of the Year. In 2000 he won the Prince of Asturias Award in Sports. In 2002, Sports Illustrated magazine named him Sportsman of the Year. He was also named Associated Press Male Athlete of the Year for the years 2002–2005. He received ESPN's ESPY Award for Best Male Athlete in 2003, 2004, 2005, and 2006, and won the BBC Sports Personality of the Year Overseas Personality Award in 2003. Armstrong announced his retirement from racing on July 24, 2005, at the end of the 2005 Tour de France but returned to competitive cycling in January 2009 and finished third in the 2009 Tour de France. He confirmed he had retired from competitive cycling for good on February 16, 2011.