St. Mungo's Hospital for Magical Maladies and Injuries is a fictional place in the Harry Potter series of books. St. Mungo's Hospital for Magical Maladies and Injuries is the wizarding hospital of Britain. Doctors at the hospital are not called doctors, but are known as Healers. They wear lime-green robes. To become a Healer, a Hogwarts student must have N.E.W.T.s of at least grade E (Exceeds Expectations, second highest possible grade) in the subjects of Transfiguration, Potions, Charms, Herbology and Defence Against the Dark Arts.

St. Mungo's is located in London. To enter the premises, one has to step through the window of what appears to be a derelict department store called Purge and Dowes Ltd. This acts as a magical gateway to the main building, very much like the magical barrier at King's Cross railway station on Platform 9 and 3/4. The exteriors of the hospital are red-bricked and dirty, which is the complete opposite of the interiors. Inside, everything is very neat and looks exactly as a hospital should. There are six floors:

• Ground Floor. Reception (where a plump, blonde witch greets you as you enter) and Artifact Accidents
• Floor 1. Creature-Induced Injuries
• Floor 2. Magical Bugs and Diseases
• Floor 3. Potion and Plant Poisoning
• Floor 4. Spell Damage
• Floor 5. Tea Rooms and Hospital Shop

St. Mungo's was founded by Mungo Bohnam, the famous Healer, in the 1600's. The exact date is unknown. St. Mungo's emblem is a magic wand crossed with a bone.

Harry Potter first enters St. Mungo's after Mr. Arthur Weasley was attacked by a snake (Harry actually witnessed this attack in a dream). On the same visit, Harry also encounters Gilderoy Lockhart, who was sent to St. Mungo's three years previously; Broderick Bode, a Ministry of Magic employee; and Neville Longbottom's parents.

Professor Minerva McGonagall also had to spend some time there when she received four Stunning Spells to her chest from accomplices of Dolores Umbridge who were trying to remove Rubeus Hagrid from Hogwarts.

Lucius Malfoy's generous donations to St. Mungo's hospital have helped to give him influence with the Ministry of Magic and Cornelius Fudge.