The Misuse of Magic Office is a division of the British Ministry of Magic, presumably falling under the Department of Magical Law Enforcement. Judging by the name, it deals with cases of misused magic by wizards.
The Misuse of Magic Office may be who would prosecute a hypothetical case of a witch using a Love Potion to marry a Muggle, and then forcing him to act as "an occasional table", though this may instead be handled by the Auror Office, the Obliviators, the Wizengamot, all of the listed agencies, or none of the listed agencies.
Behind the scenes
- The Misuse of Magic Office is only mentioned on a question on the Wizards' Ordinary Magic and Basic Aptitude Test once hosted on J. K. Rowling's Official Site. Given the similarity in name, it is possible this office was actually meant to be listed as the Improper Use of Magic Office or Misuse of Muggle Artefacts Office, rather than a new division.
- J. K. Rowling's Official Site (Mentioned only)
Notes and references