Stephen Roche (born November 28, 1959 in Dundrum near Dublin, Ireland) is a retired professional road racing cyclist. In a 13-year professional career, he peaked in 1987, becoming only the second cyclist in history to win the Triple Crown of overall victories in the Tour de France and the Giro d'Italia stage races, plus victory in the World Cycling Championship. Roche's rise to prominence in the sport coincided with that of his fellow Irishman and great friend Seán Kelly although the two were never teammates.

Although generally acknowledged as one of the finest cyclists of his generation and admired by purists for his effortless pedalling style, he struggled with a series of chronic knee injuries and never meaningfully contended in the Grand Tours post-1987. Although a Tour de France victor, it is said that Roche never competed at peak fitness in a truly open and competitive race including the prominent riders of his generation. By the time of his retirement, Roche's palmares comprised 58 professional wins. Post-retirement, Roche's achievements in the saddle have been undermined by Italian judicial assertions that he was administered with performance enhancing drugs during his professional career.