Roy Sentjens (born 15 December 1980) is a retired Belgian road bicycle racer, who competed as a professional between 2002 and 2013.

Sentjens held dual citizenship, from both Belgium and the Netherlands, and from 2002 until 2004 raced under a Dutch licence.

[4] After being selected to ride the 2010 Vuelta a España did not start stage 12 after a positive doping test came to light.

[5] On 8 September 2010, while he was riding the 2010 Vuelta a España, it was announced that Sentjens had failed an out of competition doping control and would be suspended from cycling.

[6] On 10 September, Sentjens admitted to having doped with EPO that he had obtained in Barcelona, Spain, and declined to request the testing of his B-sample.