Aurors' mission is to pursue and apprehend Dark wizards. the Auror office takes in new recruits with a minimum of 5 N.E.W.T.s (nothing "Exceeds Expectations"). Potions, Defence Against the Dark Arts, Transfiguration, Charms, and Herbology N.E.W.T.s are best suited. With that, the office takes in students into its training program. Aurors were authorised to use the Unforgivable Curses on suspected Death Eaters: given the licence to kill, coerce and torture them.

The Improper Use of Magic Office is responsible for investigating offenses under the Decree for the Reasonable Restriction of Underage Sorcery and the International Confederation of Wizards' Statute of Secrecy. They regulate an under-age wizard or witch's use of magic and prohibit wizards and witches from performing magic in the presence of Muggles or in a Muggle-inhabited area. An enchantment called "the Trace" is placed upon children and helps the department in detecting offences; it breaks at age 17.

The Wizengamot serves as the wizard high court of law. It also appears to be similar to the real-life Parliament.

They pursue the day-to-day law offences.

The Department of Magical Accidents and Catastrophes is responsible for repairing accidental magical damage in the world of Harry Potter. It is located on the third level of the Ministry of Magic.

a squad of wizards whose job it is to reverse "accidental magic." These accidents are normally caused by young witches and wizards who have not learned to control their magic. They may also be caused by older wizards out of control, or severe, unintentional effects of charms or spells.

"Obliviator" is the designation for a Ministry of Magic employee who has the task of modifying the memory of a Muggle after witnessing incidents belonging to the Wizarding world.

The Muggle-Worthy Excuse Committee explains any major magical accidents to the Muggles by creating a non-magical reason for the accident.

the Department for the Regulation and Control of Magical Creatures is divided into three divisions ("Being", "Beast" and "Spirit") and contains liaison offices for goblins and centaurs, though the centaurs, being isolationists, have never interacted with the Centaur Liaison Office since its creation. Thus, "being sent to the Centaur Office" has become a euphemism at the Ministry for those about to be fired.

The Department of International Magical Cooperation is an agency that attempts to get wizards from different countries to cooperate in wizarding actions both political and public.

The International Confederation of Wizards (ICW) has many responsibilities, mostly to enforce the International Statute of Wizarding Secrecy.

The full power and role of the ICW has never been explored in much detail, though it is possible that it is a form of magical United Nations meant to unite all the Ministries of Magic in the world. It is known to have met in 1692, at which time numerous important measures were passed, such as the establishment of the right for wizards to carry wands at all times. It is possible the ICW was involved in the final break between the Wizarding and Muggle worlds, due to anti-magical persecution.

The Department of Magical Transportation is responsible for various aspects of magical transport.

Responsible for setting up and maintaining the network, and distributing the greenish floo powder.

Controls the traffic of broom travel.

The regulation of Portkeys.

Grants licences to witches and wizards so that they can apparate.

The Department of Magical Games and Sports, seen as the most relaxed department (posters for favourite Quidditch teams are found tacked to the walls), deals with organising sports events the likes of the Quidditch World Cup and the Triwizard Tournament.