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.

[4] Yvonne van Vlerken was born in the small town of Krimpen aan de Lek near Gouda on 5 November 1978.

Her clients included school children for dance education and older people for fitness coaching.

[citation needed] 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.