Cultösaurus Erectus is the seventh studio album by American rock band Blue Öyster Cult, released in June 1980.

It also represents the band's first collaboration with British producer Martin Birch (Deep Purple, Fleetwood Mac, Black Sabbath, Iron Maiden), who would also produce the band's following album Fire of Unknown Origin a year later.

The album cover features the central part of the painting Behemoth's World by British artist Richard Clifton-Dey.

The title "The Marshall Plan" is a play on words, connecting the post-World War II economic program with the British amplifier manufacturer.

[citation needed] The song also includes a cameo by Don Kirshner introducing Johnny, the subject of the song, as an act on Don Kirshner's Rock Concert, a syndicated concert program popular in the 1970s and early 1980s.