Styx – Equinox
- Label: A&M Records SP-4559 / TML-MR 20204 CANADA
- Country: Canada
- Released: 1975
- Grade LP: (VG+) Sleeve: (G+)
Equinox is the fifth album by Styx, released in December 1975.
The album was the band's first release for A&M Records
The album also marked the final appearance of original Styx guitarist John Curulewski who left the band abruptly following the release of Equinox.
The album's biggest hit was the track "Lorelei", which was Styx's second US Top 30 hit. Another well-known song in the album was "Suite Madame Blue" (the title of which has a play on the word "sweet" to refer to the musical term of "suites", i.e. unrelated instrumental successions) which was written about the upcoming Bicentennial of the US. The track became a staple for all Styx tours with Dennis DeYoung.
Although Equinox stalled at #58, it went Gold in 1977