Gebrüder Gumbold or the Gumbold Brothers was a fictional Swiss law firm based in Bern, Switzerland. As its name would suggest, it was a partnership of two brothers. The firm was notable as a middle-man between the London College of Arms and the criminal fugitive, Ernst Stavro Blofeld. It appeared in the 1969 James Bond film, On Her Majesty's Secret Service, and was based on the Gebrüder Gumpold-Moosbrugger law firm mentioned in Ian Fleming's 1963 novel of the same name.
Gumbold and his brother were Swiss solicitors who operated from an office in Bern, Switzerland. One of his clients was the infamous outlaw, Ernst Stavro Blofeld, who had gone into hiding at his Alpine clinic, Piz Gloria, following the failure of his scheme to blackmail the Western powers with stolen atomic bombs. Between June and August 1969, Gumbold acted as a middle-man in Blofeld's secretive correspondence with the College of Arms in London, as he attempted to legally obtain the title of "Count Balthazar de Bleuchamp". James Bond discovered the connection via the Head of the Unione Corse crime syndicate, Marc-Ange Draco, and infiltrated Gumbold's office during his lunch hour. By the time he returned, 007 had cracked his safe and photocopied letters between the parties involved.
- Correspondence between Gebrüder Gumbold and Bleuchamp (dated 3rd August, 1969) list two Gumbolds. Their initials, possibly "E" and "G", are barely legible.