Although the single failed to reach the top 40, "Iron Man" remains one of Black Sabbath's most popular songs, as well as the band's highest charting U.S. single until 1998's "Psycho Man".
Selv om singlen ikke nåede top 40, er Iron Man forblevet en af Black Sabbaths mest populære sange, ligesom det var deres højest placerede single i USA indtil "Psycho Man" fra 1998.