Procol Harum () were an English rock band formed in Southend-on-Sea, Essex, in 1967. Their best-known recording is the 1967 hit single "A Whiter Shade of Pale", one of the few singles to have sold more than 10 million copies. Although noted for their baroque and classical influence, Procol Harum's music is described as psychedelic rock and proto-prog with hints of the blues, R&B, and soul.

In 2018 the band was honoured by the Rock and Roll Hall of Fame when "A Whiter Shade of Pale" was inducted into the new Singles category.