St Mungo's Hospital for Magical Maladies and Injuries is the primary, and likely only, wizarding hospital in Great Britain. It was founded in the 1600s by the famous Healer, Mungo Bonham. The hospital's purpose is to treat the wide and unusual range of ailments and injuries that can afflict witches and wizards, from spell damage to magical creature bites. The entrance to St Mungo's is concealed from Muggles within a dilapidated-looking former department store in London called Purge and Dowse Ltd. The shop front features dusty mannequins and a sign proclaiming it is “Closed for Refurbishment.” To enter, a witch or wizard must speak to the ugliest of the mannequins in the window, stating their purpose. They are then able to walk directly through the display glass, which ripples like water, into the hospital's reception area. The interior of the reception is typically chaotic and crowded, filled with patients suffering from bizarre magical conditions. It is staffed by a Welcome Witch who directs visitors and patients to the appropriate wards. The overall atmosphere is a strange combination of a traditional hospital and the magical world's inherent pandemonium. The staff, known as Healers, wear lime-green robes.
St Mungo's is a key location in Harry Potter and the Order of the Phoenix.
In Harry Potter and the Half-Blood Prince, Katie Bell is treated at St Mungo's for several months after she is cursed by a bewitched opal necklace intended for Albus Dumbledore.
St Mungo's is organised by floor, with each level dedicated to a specific category of magical malady.