The Masked Marauders is a record album released on the Warner Bros./Reprise/Deity label in the fall of 1969 that was part of an elaborate hoax concocted by Rolling Stone magazine.

In its October 18, 1969 issue, Rolling Stone ran a tongue-in-cheek review of a non-existent album that purportedly captured a "super session" of the era's leading rock and roll musicians, including Bob Dylan, Mick Jagger, George Harrison, John Lennon, and Paul McCartney. The review claimed that none of the artists could be listed on the jacket cover because of contractual agreements with their recording companies. The editors involved decided to extend the joke by hiring a relatively obscure band to record an actual album and then secured a deal with Warner Bros. As an indication of how many people were taken in by the joke, The Masked Marauders reached No. 114 on Billboard's album chart.

The Masked Marauders began as a spoof dreamed up by Rolling Stone editor Greil Marcus. Under the pseudonym T.M. Christian (a reference to Terry Southern's novel The Magic Christian), Marcus wrote a satiric review of a fictitious double bootleg album in collaboration with record reviewer Bruce Miroff. The review was intended to parody the "supergroup" trend then taking place (Crosby, Stills, Nash & Young, Blind Faith) and was also inspired by Great White Wonder, a double album of unreleased Dylan recordings often credited as the first bootleg.

Many readers, however, took the review seriously, despite its obvious jokes:

Enquiries began pouring into Rolling Stone regarding the album’s availability, not only from fans and retailers, but reportedly from the artists' managers, Allen Klein (Beatles and Rolling Stones) and Albert Grossman (Dylan). The response sparked part two of the put-on: the album itself. Marcus and Rolling Stone editor Langdon Winner recruited the Cleanliness and Godliness Skiffle Band, a Berkeley, California, group which had an album the previous year on Vanguard Records and played frequently at San Francisco’s Fillmore and Avalon ballrooms. The group initially recorded three of the songs cited in the review: the Nashville Skyline-inspired instrumental "Cow Pie", Jagger doing "I Can’t Get No Nookie" (deemed "an instant classic"), and Dylan’s "Duke of Earl".

After the songs aired on San Francisco and Los Angeles radio stations – from tapes Marcus supplied – the pranksters began looking for a major label to produce an album. Several recording companies expressed an interest, but Warner Bros. won the production rights, offering a $15,000 advance plus its considerable promotional power. In November 1969, Warner released The Masked Marauders as a single LP on its newly created Deity label, distributed by Reprise. The album, which sold more than 100,000 copies, spent 12 weeks on the Billboard album chart, peaking at No. 114. The single "Cow Pie" appeared on the Bubbling Under the Hot 100 chart at No. 123 for one week on November 29, 1969.

Tipping off buyers to the joke (albeit after they had purchased the album), Warner inserted the Rolling Stone review as well as a San Francisco Chronicle column by critic Ralph J. Gleason, a co-founder of Rolling Stone. Gleason found it incredible anyone believed the review and declared the gag a "delightful bit of instant mythology." The closing track, "Saturday Night at the Cow Palace," also made clear the album was all in fun. The track featured a riotous monologue by a record buyer so indignant at being taken in by the hoax that he vows, "When I get through with those people at Deity Records, I’ll have them walking out of the building in barrels." The album's liner notes, penned by "T.M. Christian," also offered its share of clues, most notably the line:

"In a world of sham, the Masked Marauders, bless their hearts, are the genuine article."