Simon Špilak (born 23 June 1986) is a retired Slovenian professional road bicycle racer.

Born in Tišina, Špilak was the winner of the 2010 Tour de Romandie, after original race winner Alejandro Valverde had his results expunged as part of a doping suspension. Špilak went on to gain second place in that race in 2013 and 2014, both times behind Chris Froome. In 2013, he was the victor of the GP Miguel Induráin and the Eschborn–Frankfurt City Loop, his only two victories of the year. In 2015, he won the general classification of the Tour de Suisse with only five seconds of an advantage over Geraint Thomas. The victory was decided on the last day's time trial. Špilak was considered a rarity in road cycling in that he is a general classification rider who targets one-week races rather than the three-week Grand Tours. In an interview he said that he disliked the heat, so he was always preparing for spring races instead of Grand Tours which took part mostly in summer.

In October 2019, Špilak announced his retirement after his Team Katusha–Alpecin team folded.

Media related to Simon Špilak at Wikimedia Commons