Roger Greenspun of
The New York Times wrote, "Karloff himself, cadaverous and almost wholly crippled, acts with a quiet lucidity of such great beauty that it is a refreshment merely to hear him speak old claptrap. Nothing else in
The Crimson Cult comes close to him – though there is Barbara Steele in greenface playing Lavinia, a glamorous 300-year-old and a monumental cast that lists no fewer than seven-party girls, plus several sacrificial virgins."
Variety wrote that as one of Karloff's final pictures, "it would have been nice if it had been a better role. As it is, it is a totally unabashed rehash of a formula that Karloff has been identified with through the years."
Kevin Thomas of the
Los Angeles Times called the film "a delight for horror fans, with Karloff in top form despite the infirmities of age."
The Monthly Film Bulletin wrote that apart from a wild party and some exposure of a woman's bosom in a bed, "this is one of the lamest and tamest horrors in a long time, with the script hobbling along like an underprivileged Agatha Christie thriller through acres of would-be sinister dialogue as the handsome hero investigates endlessly and Karloff and Christopher Lee dispense meaningful sneers."
The Radio Times Guide to Films gave the film 2/5 stars, writing: "With a title like this you'd expect sacrifices galore, but none was as great as that made by its star, Boris Karloff. The horror legend makes one of his final screen appearances in this lacklustre offering about devil worship in an old dark house." ==References==