St Mungo's Hospital for Magical Maladies and Injuries

• Type: Hospital
• Location: London, England
• Owner/Residents: Founded by Mungo Bonham; operated by a board of governors and staffed by Healers.
• Key Features: Disguised Muggle-repelling entrance, specialised wards for magical ailments, emblem of a crossed wand and bone.

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.

• Arthur Weasley is brought to the hospital after being viciously attacked by Nagini while guarding the Department of Mysteries. Harry Potter witnesses the attack through his mental link with Lord Voldemort. The Weasley family, along with Harry Potter and Hermione Granger, visit him on Christmas Day.
• During their visit, Harry, Ron Weasley, and Hermione inadvertently discover that their former Defence Against the Dark Arts teacher, Gilderoy Lockhart, is a long-term patient, still suffering from amnesia caused by a backfired Memory Charm.
• Most significantly, they encounter Neville Longbottom visiting his parents, Frank Longbottom and Alice Longbottom. They are revealed to be permanent residents of the Janus Thickey Ward, having been tortured into insanity by Death Eaters Bellatrix Lestrange, Rodolphus Lestrange, Rabastan Lestrange, and Barty Crouch Jr.. This encounter provides Harry with a deeper understanding of Neville's character and tragic past.
• Later in the book, Minerva McGonagall is admitted to St Mungo's after being hit with four simultaneous Stunning Spells while defending Rubeus Hagrid from Dolores Umbridge and her cronies.

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.

• Ground Floor - Artefact Accidents: This ward handles injuries from backfiring wands, cauldron explosions, broom crashes, and other object-related incidents.
• First Floor - Creature-Induced Injuries: This floor treats bites, stings, burns, and embedded spines from various magical creatures. The 'Dangerous' Dai Llewellyn Ward for Serious Bites, where Arthur Weasley was treated, is located here.
• Second Floor - Magical Bugs: This ward deals with contagious illnesses such as Dragon Pox, Scrofugulus, and Vanishing Sickness.
• Third Floor - Potion and Plant Poisoning: This floor handles rashes, regurgitation, and uncontrollable giggling caused by incorrect potions or contact with dangerous magical plants.
• Fourth Floor - Spell Damage: This ward is for patients suffering from unliftable jinxes, hexes, curses, and incorrectly applied charms. The Janus Thickey Ward for permanent spell damage is located here, housing patients like Gilderoy Lockhart and the Longbottoms.
• Fifth Floor - Visitors' Tearoom and Hospital Shop: A place for visitors to rest and purchase gifts or refreshments.

• The hospital's founder, St. Mungo, is also the name of the patron saint of Glasgow, Scotland. The historical St. Mungo was said to have performed four religious miracles, making the name fitting for the founder of a magical healing institution. (J.K. Rowling interview)
• The emblem of St Mungo's is a wand crossed with a bone. (Pottermore)
• In the film adaptation of Harry Potter and the Order of the Phoenix, the hospital's interior is depicted with a more orderly, yet still magical, design. The Janus Thickey Ward is shown as a circular room with large windows, where the scene with the Longbottoms takes place. (film)