Diego Rosa (born 27 March 1989) is an Italian racing cyclist, who rides for Team Sky. He rode in the 2014 Giro d’Italia and was victorious in the 2015 Milano–Torino.
In August 2014, Astana announced that they had signed Rosa for the 2015 season, with general manager Alexander Vinokourov highlighting his role as a domestique for Fabio Aru. His first professional victory was the 2015 Milano–Torino. In 2016, he won a mountain stage of the Tour of the Basque Country. He celebrated his solo win by stepping off his bike and crossing the finish line by foot, holding his bicycle in the air.
Rosa has competed in four Grand Tours. In his Grand Tour debut, the 2013 Giro d’Italia, he finished 22nd overall. After not finishing the 2014, he finished in the top 25 in both the 2015 Giro d’Italia and the 2015 Vuelta a España.
He joined Team Sky for the 2017 season.