The question is, which was the first group ever referred to as a “supergroup”? By my memory, it was Crosby, Stills, and Nash.

I think it was CREAM.

LP – Fresh Cream 1966.

Ref : Rolling Stone editor Jann Wenner.

Paul

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In my mind it was the lineup on the Super Session album: Mike Bloomfield, Steve Stills, Al Kooper, Harvey Brooks

https://en.wikipedia.org/wiki/Super_Session

Quote: “The success of the album opened the door for the “supergroup” concept of the late 1960s and 1970s, as exemplified by the likes of Blind Faith and Crosby, Stills & Nash. Despite the fact that Bloomfield left the recording session after the first day, he and Kooper made several concert appearances after the album was released. The results of one of those became the album The Live Adventures of Mike Bloomfield and Al Kooper.[8]”

Fun fact: I attended Blind Faith’s inaugural free concert in Hyde Park, London in 1969. It did not live up to the intense hype the publicists were putting out beforehand. “Hype” was a fairly recently coined concept at that point in history, it was soon to become an epidemic.