The Grand Illusion is the seventh studio album by American rock band Styx. Recorded at Paragon Recording Studios in Chicago, the album was released on July 7, 1977, by A&M Records, intentionally choosing the combination 7th on 7-7-77 for luck. The release was a smash worldwide, selling three million copies in the US alone. Some estimates have the album at over 6 million copies sold. The album launched the band to stardom and spawned the hit singles "Come Sail Away" and "Fooling Yourself." The title track also received substantial FM airplay, but was never released as an official single.

Styx is an American rock band formed in Chicago, Illinois, in 1972. They are known for blending melodic hard rock guitar with acoustic guitar, synthesizers mixed with acoustic piano, upbeat tracks with power ballads, and incorporating elements of international musical theatre. The band established themselves with a progressive rock sound during the 1970s, and began to incorporate pop rock and soft rock elements in the 1980s.