| Nathan O'Neill | |
| Fullname: | Nathan O'Neill |
| Birth Date: | 1974 11, df=yes |
| Birth Place: | Sydney, Australia |
| Weight: | 72kg (159lb) |
| Currentteam: | Retired |
| Discipline: | Road |
| Role: | Rider |
| Ridertype: | Time trialist |
| Proyears1: | 1999 |
| Proteam1: | (stagiaire) |
| Proyears2: | 2000–2002 |
| Proyears3: | 2003 |
| Proteam3: | Saturn Cycling Team |
| Proyears4: | 2004 |
| Proyears5: | 2005 |
| Proyears6: | 2006–29 Oct 2007[1] |
| Proyears7: | 2009 |
| Proyears8: | 2010 |
| Proteam8: | Bahati Foundation Pro Cycling Team |
| Majorwins: |  National Time Trial Champion x8 |
Nathan O'Neill (born 23 November 1974) is an Australian former professional road racing cyclist.[2] During his career, O'Neill became an eight-time winner of the Australian National Time Trial Championships and an Olympian in the 2000 Sydney Olympic Games.
O'Neill was born in Sydney in 1974. He began cycling in 1989, when he attended a 16 kilometre handicap race before school, following the suggestion by a friend. He went on to win numerous medals in the junior ranks at the Australian National Track Championships. At the Junior UCI Track Cycling World Championships in 1992, O'Neill won the bronze medal as part of the team pursuit squad. In 1995, he won the silver medal in the road time trial at the Oceania Cycling Championships whilst nursing a broken pelvis.[3] He was an Australian Institute of Sport scholarship holder.[4]
From 1 September 1999, he rode for the Navigare – Gaerne team as a trainee rider before turning professional for the team in 2000 at the age of 25, under new sponsors Panaria – Gaerne. He represented Australia at the 2000 Summer Olympics, finishing 19th in the individual time trial. He stayed with the same team for 2001–2002, under Panaria – Fiordo's sponsorship. O'Neill won the bronze medal in the individual time trial at the 2002 Commonwealth Games in Manchester, United Kingdom.
In 2003, O'Neill signed with the Saturn Cycling Team, 2004 for Colavita – Olive Oil, 2005 for Navigators Insurance Cycling Team and finally for Health Net Pro Cycling Team in 2006.
At the Commonwealth Games in Melbourne, Australia, 21 March 2006, O'Neill won the Gold Medal in the Time Trial finishing in a time of 48:37.29.
He became the Australian National Time Trial Champion for the eighth time in January 2007, it was the fourth consecutive time.[5]
On 12 August 2007, at the Tour of Elk Grove, O'Neill provided a sample which tested positive for the appetite suppressant drug phentermine.[6] O'Neill received notification of this on 23 September 2007. Later, the B sample also tested positive, he admitted that he had used the medicine for the prescribed purpose out of competition. The drug was not banned for use out-of-competition, and O'Neill maintains that his error is due to a longer than expected clearance time for the drug, compounded by another supplement which increased his urinary pH that he was also taking in the days leading up to the event.[7] On 6 November 2007, O'Neill was terminated by the Health Net Pro Cycling Team.
On 13 June 2008 the Court of Arbitration for Sport (CAS) ruled that O'Neill bore "no significant negligence" in registering a positive finding for Phentermine, and was given a 15-month suspension, from 12 August 2007 to 12 November 2008.
The Australian Sports Anti-Doping Authority (ASADA), the World Anti-Doping Agency (WADA) and the UCI jointly appealed to the CAS to increase the suspension period "on the grounds that the athlete had not demonstrated no significant fault or negligence". The CAS also stated that "Also of importance is the evidence from Mr O'Neill that he took the risk because he was of the view that without Phentermine he was not going to be competitive. Mr O'Neill therefore self-medicated with a view of gaining a competitive advantage." The suspension was extended to the maximum period of two years, due to come to end on 13 June 2010.[8]
O'Neill currently lives with his wife in Athens, Georgia, in the United States. In 2012, he founded Dingo Race Productions, LLC. Race productions include Tour of the Southern Highlands, In 2016, Nathan started OnEdge Sportsales, LLC with his then fiancé. OnEdge Sportsales is an independent sales company, representing multiple top brands throughout the Southeast.O'Neill has a daughter, born in 2006 to his former wife.