The Great Conspiracy is the second studio album by the Los Angeles psychedelic rock band, The Peanut Butter Conspiracy (PBC) on Columbia Records in December 1967. Gary Usher, who produced their debut album, The Peanut Butter Conspiracy Is Spreading, was again the producer for this album. It was the last time the group released new material with Columbia as their contractual obligations were met. Their second album is regarded as the best of the group's outputs for its solidified sound in psychedelic music.