Diagon Alley is a high street located in London. It is accessible to the wizarding world, to which it is something of an economic hub, but hidden from Muggles (non-magical people). However, Muggles are allowed access to it if they need to accompany their Muggle-born magical children.

Within the fictional lore of Harry Potter, Muggles are strictly forbidden from entering Diagon Alley unless they are the parents or legal guardians of a "Muggle-born" witch or wizard (such as Hermione Granger's parents). The entrance is hidden behind the Leaky Cauldron pub, which most Muggles physically cannot see due to protective charms. However, in the real-world context of Universal Studios (Orlando, Hollywood, Osaka, Beijing) in 2026, "Muggles" (the guests) are the primary visitors. The immersion is designed to make you feel as though you have bypassed the magical secrecy. To enter the Orlando version, you must walk through a "brick wall" transition near the London waterfront. While the shops and restaurants like Ollivanders or The Leaky Cauldron are fully accessible to all guests, the cast members stay in character, often referring to guests as "Muggles" and acting surprised by their non-magical technology. This meta-narrative allows everyone to enjoy the wizarding world regardless of their lack of magical bloodline or an official Hogwarts acceptance letter.