Prisión Fatal (2009) (Spanish for "Fatal Prison") was a professional wrestling supercard event produced by Mexican professional wrestling promotion International Wrestling Revolution Group (IWRG), and took place on July 5, 2009 in Arena Naucalpan, Naucalpan, State of Mexico, Mexico. The main event was the eponymous Prison Fatal (Spanish for "Deadly Prison") Steel cage match where the last person remaining in the cage was forced to be shaved bald or have to unmask as per the match stipulation. 2009 was the first second time that IWRG used the match concept Prisión Fatal. first held in 2000.
In the main event Avisman, Suicida, Bushi and Freelance were all chained to the cage by one hand and had to fight to get a key to unlock the chain and escape. Suicida was the last man in the ring as Avisman climbed over the cage and out, which forced Suicida to have all his hair shaved off afterward. If Bushi had lost he would have been forced to unmask. The show featured four additional matches.