Marino Lejarreta Arrizabalaga (born 14 May 1957 in Berriz, Biscay) is a retired Spanish professional road racing cyclist.
His biggest victory was capturing the 1982 Vuelta a España, a Grand Tour stage race, and he is the inaugural and record three-time winner of the Clásica de San Sebastián (1981, 1982, 1987), which is now considered a one-day classic.
In 1989, Lejarreta captured the Volta a Catalunya repeating one of his first professional wins in 1980 at the same event.
Until 2015, Lejarreta was the only person in history to complete all three Grand Tours in a single year four times in a career; he did the triple in 1987, 1989, 1990 and 1991.