Death Eaters
The Order of the Phoenix
Wizengamot
Ministry for Magic
Quidditch teams
Official Gobstones Club
Dumbledore's Army
Inquisitorial squad
Slug Club
The Knights of Walpurgis
B.O.G (Brotherhood of Goblins)
Most Extraordinary Society of Potioneers
The Order of Merlin
Q.U.A.B.B.L.E (Quidditch Union for the Administration and Betterment of the British League and its Endeavors)
S.P.E.W (Society for the Promotion of Elvish Welfare)
Society for the Reformation of Hags
S.S.S (Society for the Support of Squibs)
S.T.V ( Society for the Tolerance of Vampires)
Order of the Mark (or Seal)
Order of the Fang
Order of the Talon
Order of the Stripe
Order of the Mane
Society for Distressed Witches
The Medieval Assembly of European Wizards
The Order of Air Voyagers for Intrepid Wizards
International Confederation of Wizards
International Task Force
Snatchers
the Dark Force Defense League
International Federation of Warlocks
Troll Rights Movement
The Wizarding Examinations Authority
Hufflepuff
Ravenclaw
Slytherin
Gryffindor
The Headless Hunt
Campaign for Greater Freedom of wizards