An Ironman Triathlon is one of a series of long-distance triathlon races organized by the World Triathlon Corporation (WTC), consisting of a 2.4-mile (3.9 km) swim, a 112-mile (180.2 km) bicycle ride and a marathon 26.22-mile (42.2 km) run completed in that order, a total of 140.6 miles (226.3 km). It is widely considered one of the most difficult one-day sporting events in the world.
Mark Allen is an American triathlete and six-time Ironman Triathlon World Champion.
Paula Newby-Fraser is an Ironman triathlete and duathlete.
Vassilis Krommidas is a triathlete and coach from Greece best known for competing at the 2000 and 2004 Olympic Games.
Andrew Robert Potts is a triathlete from the United States. He competed in triathlon at the 2004 Summer Olympics and is the 2007 Ironman 70.3 World Champion. Prior to triathlon, Potts was a swimmer where he won the bronze medal in the men's 400m individual medley at the 1995 Summer Universiade and earned a spot on the USA Swimming national team where he would place fourth at the 1996 Olympic Trials in the 400 IM.
Normann Stadler is a retired professional triathlete from Germany. He is the winner of the 2004 and 2006 Ironman Triathlon World Championship in Hawaii.
Madonna Buder,, also known as the Iron Nun, is an American Senior Olympian triathlete and former religious sister. Buder has the current world record for the oldest woman to ever finish an Ironman Triathlon, which she obtained at age 82 by finishing the Subaru Ironman Canada on August 26, 2012.
Erin Margaret Baker is a former New Zealand triathlete. She won many world championship and Ironman titles.
Spencer Smith is a British triathlete who won ITU Triathlon World Championships in 1993 and 1994.
Rudy Garcia-Tolson is a Paralympic swimmer, runner and triathlete from the USA.
Luke Bell is an Australian triathlete, specializing in long course triathlons, particularly half-ironman and Ironman distance. Bell was born in Portland, Australia, but currently resides in Melbourne. Bell spends time training in Boulder, Colorado during the Australian winter.
Chris Lieto is a professional triathlete and the winner of the 2006 Ironman Japan, 2005 Ironman Canada, and 2002 Ironman Wisconsin triathlons.
Dirk Bockel is a professional triathlete originally from Schwaikheim, Germany. He holds Luxembourgish nationality and raced for Luxembourg in the 2008 Olympic Games in Beijing.
Scott Neyedli was a full-time professional Ironman triathlete (2007-2011), winning British and multiple Scottish Triathlon Championships. He is a 2 x Ironman Champion winning Ironman UK in 2007 in a marathon and course record time and Ironman Wales in 2013 with the fastest bike and marathon run splits of the day. More remarkable Scott won Ironman Wales whilst working full-time after resuming his oil and gas engineering career full-time at the start of 2012 due to sponsorship pitfalls. Scott has represented Great Britain at Elite level ITU Championships, placing Top Briton and 9th place at the ITU World Long Distance Triathlon championships in 2011 along with Top Briton placings at the World Ironman Championships in Kona Hawaii. Scott also won European Team Silver at the European Championships in 2007. Scott is still ranked one of the fastest British Ironman athletes and at the top of GB's best medal tally at Ironman Competition and still holding the current WTC Scottish Ironman record at 8hrs 17 mins 47 sec.
Dave Scott is a U.S. triathlete and the first six-time Ironman Triathlon Hawaii Champion. A progenitor of the sport, in 1993, Scott was the first person ever inducted in the Ironman Hall of Fame. He is known by the nickname "The Man" for his intense training regimens and his unrelenting race performances that created a record number of wins.
Caroline Steffen is a professional triathlete from Switzerland. She is the winner of the 2010 and 2012 ITU Long Distance Triathlon World Championships and took second at the 2010 and 2012 Ironman World Championship. Before competing as a professional triathlete she was a member of the Lifeforce Pro Cycling Team.
Mary Beth Ellis is a retired American long-distance triathlete. She holds the record for the fastest iron-distance race by an American woman, set at Ironman Austria in 2011 with a time of 8:43:34. She is the 2015 ITU Long Distance Triathlon champion and has taken second place at both the 2008 and 2009 Ironman 70.3 World Championship. She has been named USA Triathlon's Non-Olympic/ITU Female Athlete of the Year for both 2011 and 2012.
Bill Chaffey is an Australian paratriathlete who won his fifth world championship in 2015. He represented Australia at the 2016 Rio Paralympics when paratriathlon made its debut at the Paralympics.
The 2014 Ironman World Championship was a long distance triathlon competition that was held on October 11, 2014 in Kailua-Kona, Hawaii. The event was won by Sebastian Kienle of Germany and Australia's Mirinda Carfrae. It was the 38th edition of the Ironman World Championship, which has been held annually in Hawaii since 1978, with an additional race in 1982. The championship was organized by the World Triathlon Corporation (WTC) and awarded a total purse prize of $650,000.
Lionel James Sanders is a Canadian professional triathlete and the winner of the 2017 ITU Long Distance Triathlon World Championships. In 2017 and 2021, he also placed second at the Ironman World Championship. In 2014 he placed fourth in the 2014 Ironman 70.3 World Championship held in Mont-Tremblant, Quebec. Sanders's first professional race was in September 2013 at the Muskoka Ironman 70.3, where he took 1st place over Andreas Raelert.
United States 
