Iris Slappendel (born 18 February 1985) is a Dutch former road racing cyclist.

[2] Slappendel took a total of five UCI race victories in her career, including the GP Comune di Cornaredo and stages of the Thüringen Rundfahrt der Frauen, the Ster Zeeuwsche Eilanden and La Route de France.

[3] In September 2014 Slappendel announced that she would join the Bigla Pro Cycling Team for the 2015 season.

In September 2016 she announced her retirement from professional competition, having won her final race, the Gateway Cup, earlier that month.

[6] Having previously represented female riders in the UCI Athlete's Commission from 2015 to 2017,[7] Slappendel now dedicates her time to The Cyclists' Alliance as executive director.