| Yvonne van Vlerken | |
| Nickname: | The flying Dutchwoman |
| Birth Date: | 5 November 1978 |
| Birth Place: | Krimpen aan de Lek, Netherlands |
| Residence: | Schwarzach, Vorarlberg, Austria |
| Height: | 1.64m (05.38feet) |
| Weight: | 570NaN0 |
| Country: | Netherlands |
| Club: | Tri Team Lustenau |
| Team: | Endurance Team Austria |
| Turnedpro: | 2007 |
| Coach: | Frank Senders Stapsport Mark Allen |
| Show-Medals: | yes |
Yvonne van Vlerken (born 5 November 1978) is a Dutch triathlete and duathlete, twice winner of Quelle Challenge Roth, who in 2008 set a world record for Ironman-distance triathlon races. She is one of a small group of female triathletes to have recorded three or more sub-9 hour times over the Ironman distance.
Yvonne van Vlerken was born in the small town of Krimpen aan de Lek near Gouda on 5 November 1978. Her father was an "excellent" football player, and she also became a footballer, playing for the South Holland team. After attending high school she graduated from a fitness-specific school with a degree in fitness coaching, professional aerobic instruction and sports massage therapy. Van Vlerken worked in her home town for over 13 years. Her clients included school children for dance education and older people for fitness coaching.
On 13 July 2008, van Vlerken set a then new world record of 8:45:48 for Ironman-distance races at the Quelle Challenge Roth, more than five minutes faster than Paula Newby-Fraser's world record time of 8:50:53, which had stood for 14 years. The race took place in wet and cold conditions with non-stop rain and wind. Yvonne van Vlerken broke the old record with the then second-fastest female Ironman-distance marathon time of 2:54:22. Her record stood for a year, until it was again broken in Roth by Chrissie Wellington, who lowered it by 13 minutes and 49 seconds, in dry and perfect conditions.
Yvonne van Vlerken's other accomplishments include: