No, The Wizarding World of Harry Potter is generally not a functional part of the Halloween Horror Nights (HHN) event at Universal Studios Florida or Universal Studios Hollywood. HHN is a separately ticketed, "adult-themed" event that focuses on intense scares, haunted houses, and "scare zones" that are inconsistent with the family-friendly and highly protected "Harry Potter" brand. In 2026, while the Wizarding World areas (Diagon Alley and Hogsmeade) typically remain open for guests to walk through and enjoy the atmosphere, they do not host any haunted houses or "scareactors." One notable exception in recent years has been the occasional appearance of Death Eaters in Hogsmeade, who engage in atmospheric "duels" with guests, but this is considered a "spooky" addition rather than a "horror" experience. If you are attending HHN in 2026 primarily for the scares, you will find most of the action in the themed "scare zones" and custom-built houses elsewhere in the park, with the Wizarding World serving as a relatively "safe" and magical sanctuary from the surrounding mayhem.