Secret Oyster is a legendary Danish instrumental jazz-fusion and progressive rock supergroup formed in Copenhagen in 1972. The ensemble coalesced following the initial disbandment of the pioneering prog-R&B group Burnin Red Ivanhoe, when saxophonist Karsten Vogel and drummer Bo Thrige Andersen sought to form a new band dedicated exclusively to complex, high-energy instrumental fusion. They recruited erstwhile Coronarias Dans keyboardist Kenneth Knudsen, Hurdy Gurdy guitarist Claus Bøhling, and elite jazz bassist Mads Vinding.

Debuting their explosive sound at the Jazzhus Montmartre in September 1972, the band drew immediate comparisons to international jazz-rock titans like Mahavishnu Orchestra, Soft Machine, and Weather Report. Their 1973 self-titled debut (released internationally as Furtive Pearl) established their sonic template: furious electric guitar soloing from Bøhling, atmospheric Moog and electric piano interplay from Knudsen, and Vogel's crying alto and soprano saxophones.

Following their debut, the rhythm section underwent a complete overhaul, with former Burnin Red Ivanhoe bassist Jess Stæhr and drummer Ole Streenberg stepping in to define the band's "classic" rhythm section. This stabilized lineup recorded the masterpiece Sea Son in 1974, highly regarded as the absolute apex of Danish jazz-rock. They pushed into more cinematic and synthesizer-heavy territories with 1975's Vidunderlige Kælling (recorded as a ballet score and released as Astarte internationally) and their final 1970s studio effort, Straight to the Krankenhaus (1976).

Disbanding in 1977, Secret Oyster left behind an immaculate four-album run before successfully reforming in 2007 for reunion tours across Denmark and the United States, cementing their legacy as Scandinavian progressive royalty.