Penile Fournier's gangrene is extremely rare due to the rich blood supply of the penis. It has only been reported in a few cases in the literature. Prompt surgical exploration, antibiotic therapy, and meticulous postoperative care are the cornerstone in the successful mangement of this high-mortality emergency. We present a rare case of penile Fournier's gangrene with total necrosis of the penis necessitating penectomy in a 70-year-old patient who is well advanced, with complete perineum healing. The goal of this article is to illustrate this rare case, as well as to explain what causes it and how to manage it.