This department has one sub-department as well as three separate offices. The sub-department, the Department of Magical Catastrophes, deals with crimes and disasters. The Improper Use of Magic Office sends letters and notifications to members of the wizarding world who are not using magic at the appropriate time or may be using an illegal spell. The Misuse of Muggle Artifacts Office keeps muggles away from any magical objects as well as keeps dark items out of circulation. Finally, the Committee On Experimental Charms regulates unsafe or unknown charms to fit into the wizarding world safely.

This department works with magical governments of other countries, set standards for trade, and creates regulations for things like cauldron thickness. During TriWizard Tournaments, they also work with the Department of Games.

This department deals with everything related to keeping laws in order and having justice throughout the wizarding world. The Magical Law Enforcement Squad employs Hit Wizards to handle dangerous criminals such as Sirius Black. These Hit Wizards, called Aurors, are highly trained professionals and are typically strong and intelligent. The Council of Magical Law is something of a tribunal or court of law, held in a dungeon; the accused is magically bound to a chair in the center of the room. A jury sits on the right of the prosecutor who states the case against the accused and eventually asks for a verdict. This court may possibly be located at Azkaban, since prisoners are escorted and guarded by groups of Dementors.

This department handles the complications of transporting folks to the World Cup, they set up a network of portkeys, and work out where it is safe to Apparate into the area without being seen. The Floo Regulation Panel regulates which fireplaces are connected to the Floo Network. This department also regulates ministry cars, which navigate through traffic with ease.

This department handles complaints about magical creatures, including goblins and ghosts, and regulates and monitors breeding of new magical creatures. There are twelve divisions within the department: Office of Misinformation, Beast Division, Committee for the Disposal of Dangerous Creatures, Dragon Research and Restraint Bureau, Office of House-Elf Relocation, Werewolf Registry, Werewolf Capture Unit, Centaur Liaison Office, Being Division, Goblin Liaison Office, Werewolf Support Services, and the Spirit Division.

The Department of Mysteries, in simplest terms, is the most complex and secretive department of the Ministry. Rarely do members, called Unspeakables, enter the department without hiding their faces and identities. The Department is heavily guarded and holds every secret to the Wizarding World, including all records and knowledge on witches and wizards, some muggles, spells and creatures, and everything imaginable. Very few people are allowed to enter.

The Atrium in the Ministry of Magic is a very large room. In the centers of the various parts of the room are large, beautiful golden statues. The Atrium is the center of the Ministry of Magic, where people pass through to visit the Floo Network, or reach other parts of the Ministry.