Floyd Landis (born October 14, 1975) is an American former professional road racing cyclist. At the 2006 Tour de France, he would have been the third non-European winner in the event's history, but was disqualified after testing positive for performance-enhancing drugs. The competition was ultimately won by Óscar Pereiro.

Landis was an all-around rider, with special skills in climbing, time-trialing, and descending. He turned professional in 1999 with the Mercury Cycling Team, joined the U.S. Postal Service team in 2002, and moved to the Phonak Hearing Systems team in 2005. In January 2010, a French judge issued a national arrest warrant for Landis on computer hacking charges related to the 2006 Tour de France, stage 17 doping allegations.

In 2010 Landis maintained his innocence and mounted a defense. Although his legal team documented inconsistencies in the handling and evaluation of his urine samples, the disqualification was upheld. He was suspended from professional competition through January 30, 2009, following an arbitration panel's 2-to-1 ruling on September 20, 2007. He appealed the result of the arbitration hearing to the Court of Arbitration for Sport, which subsequently upheld the panel's ruling. In January 2011, he was unable to find a new team, which effectively ended his professional career. On May 20, 2010, after almost four years of contesting the allegations, Landis admitted to doping, and revealed that Lance Armstrong and many other top riders who rode on his team doped as well.