Stefan Denifl (born 22 September 1987) is an Austrian former professional cyclist, who rode professionally between 2006 and 2018 for seven different professional teams. In 2019, Denifl confessed to doping during a five-year period in his career, and was given a four-year ban from the sport; as a consequence of this, Denifl received a two-year sentence in 2021 for serious commercial fraud.