Seamus "Shay" Elliott (4 June 1934 – 4 May 1971) was an Irish road bicycle racer, Ireland's first major international rider, with a record comparable only to Sean Kelly and Stephen Roche. He was the first Irish person to ride the Tour de France, first to win a stage, and first to wear the yellow jersey, and first English speaker to win stages in all the Grand Tours.

After a strong amateur period, primarily with the Dublin Wheelers, Elliott was the first Irish cyclist to make a mark as a professional rider in continental Europe. A late-starting but naturally talented rider, he spent most of his pro career riding as a domestique for team leaders such as Jacques Anquetil, and Anquetil's deputy Jean Stablinski. He came 2nd (to Stablinski) in the 1962 World Road Championship at Salò, Italy.

Aside from being the first English-speaker to lead the Tour de France, wearing the yellow jersey for three days, Elliott was first English-speaker to lead the Vuelta a España, in which he came third in 1962 and was the only English-speaker to win the Omloop "Het Volk" semi-classic until 2014 when Ian Stannard won the race. He died in unclear circumstances at the age of 36.