Stijn Devolder (born 29 August 1979) is a Belgian former professional road bicycle racer, who competed professionally for Vlaanderen–T Interim (2002–2003), Discovery Channel (2004–2007), Quick-Step (2008–2010), Vacansoleil–DCM (2011–2012), Trek–Segafredo (2013–2016), Vérandas Willems–Crelan (2017–2018) and Corendon–Circus (2019).

Primarily a classics rider but also adept in individual time trials, Devolder took a total of eighteen victories during his professional career, including three wins in the Belgian National Road Race Championships (2007, 2010 and 2013), two wins in the Belgian National Time Trial Championships (2008 and 2010), and is one of seven riders (as of 2025) to win consecutive editions of the Tour of Flanders, winning in both 2008 and 2009.