Johnny Logan (born Seán Patrick Michael Sherrard, 13 May 1954), is an Australian-born Irish singer and composer. He is regarded as "Mister Eurovision", having participated in the Eurovision Song Contest many times since the 1970s, and, since 1992, has been the most successful artist in Eurovision history.

Logan has won the international contest on three occasions representing Ireland, twice as a performer (1980 and 1987) and twice as a composer (1987 and 1992). He also composed the second placed entry in 1984.