Mirrors is the sixth studio album by U.S. hard-rock band Blue Öyster Cult, released on June 19, 1979. Mirrors was the first BÖC album not produced by long-time producer and manager Sandy Pearlman. The album features a collaboration with British fantasy/science-fiction author Michael Moorcock, who co-wrote a song based on his novel The Fireclown. "The Great Sun Jester" is the first of several Moorcock co-writing credits with the band.
After the success of 1976's Platinum Agents of Fortune, 1977's Gold Spectres and 1978's Platinum live effort Some Enchanted Evening, the fact that Mirrors struggled to reach Gold status disappointed band and label alike. According to interviews with the band and production staff, the intent for this album was to make a high-charting record with glossy production; however, the backlash from this attempt led to the band's future pairing with Martin Birch and an attempt to return to a darker sound.
Acoustic ballad "In Thee," written by Allen Lanier, went into the charts at No. 74. The line "Jim says some destinies should not be delivered" references the Jim Carroll Band song "Day and Night."