Iron Maiden

could refer to one of four techniques:
 * Black Secret Technique Machine One Shot, known in the English anime as Secret Black Move: Iron Maiden, used by Kankurō.
 * Black Secret Technique Machine Two Shot, known in the English anime as Secret Black Move: Iron Maiden 2, also used by Kankurō.
 * Black Passing Secret Fang Technique Machine One Shot, used by Kankurō and Kiba in unison.
 * Summoning: Iron Maiden, used by Ibiki.