The 2004 El Castillo del Terror (Spanish for "The Tower of Terror") was a major lucha libre event produced and scripted by the Mexican International Wrestling Revolution Group (IWRG) professional wrestling promotion on October 31, 2004. The 2004 El Castillo del Terror was the fourth ever IWRG El Castillo del Terror event held. The main event was the eponymous Castillo del Terror (Spanish for "Tower of Terror") Steel cage match where the last person eliminated would be forced to take off his wrestling mask or have his hair shaved off as a result of the loss.

Due to incomplete records of the main event, the only known participants was the winner Black Dragon and Mega as the loser of the El Castillo del Terror main event. The remaining Castillo del Terror participants are unknown.

The Mexican wrestling promotion International Wrestling Revolution Group (IWRG; Sometimes referred to as Grupo Internacional Revolución in Spanish) has a long-standing history of holding major event focused on a multi-man steel cage match where the last wrestler left in the cage would be forced to either remove their wrestling mask or have their hair shaved off under Lucha de Apuestas, or "bet match", rules. Starting in the year 20002005 IWRG has promoted a fall show, around the Mexican Day of the Death, under the name El Castillo del Terror ("The Tower of Terror"), creating an annual event on their major show calendar that has been held almost every year since 2000. The 2004 El Castillo del Terror show was the fourth overall show under that name, with IWRG not holding a Castillo del Terror in 2001.

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