Jonathan Castroviejo Nicolás (born 27 April 1987) is a Spanish professional cyclist, who rides for UCI WorldTeam Ineos Grenadiers.

[6] Castroviejo specialises in time trials, with all of his eleven professional victories – including a gold medal at the 2016 European Road Championships and a record six victories in the Spanish National Time Trial Championships – coming in the discipline.

[7] His prowess in the time trial was relatively uncommon for a Euskaltel–Euskadi rider, as the team was known for fielding lightweight climbers with little ability against the clock.

[8] Castroviejo turned in another strong time trial later in the Tour de Romandie, taking ninth in the 20.1 km (12.5 mi) long race against the clock, better than Marco Pinotti and Jean-Christophe Péraud (among others), both former champions of their respective nations in the time trial.

Castroviejo could not follow the frantic pace set by Alberto Contador (Saxo Bank–Tinkoff Bank) on the final climb of the third stage.