Derek William Dick (born 25 April 1958), better known by his stage name Fish, is a Scottish singer-songwriter and occasional actor. He achieved prominence as the lead singer and lyricist of the neo-progressive rock band Marillion from 1981 until 1988. In his solo career, Fish has explored contemporary pop and traditional folk.

Music critics have acknowledged Fish for his voice, which has been described as both "distinct" and a "conflation of Roger Daltrey and Peter Gabriel", while his lyrics have been praised as "poetic prose". In 2004, Classic Rock magazine ranked Fish #49 on the list of "The 100 Greatest Frontmen", describing him with "His theatrical delivery was a major factor in Marillion's spectacular rise, and he masterminded some uniquely ornate lyrical concepts." Fish was voted number 37 in the greatest voices in rock by Planet Rock listeners in 2009.