Founded by Idris Oakby in the early-to-mid 1900s (JKR).
Advance Guard Brotherhood of Goblins (B.O.G.) Campaign for Greater Freedom for Wizards Dark Force Defense League Death Eaters Department of Magical Law Enforcement (MACUSA) Duelling Club Dumbledore’s Army (The D.A.) Fresh Air Refreshes Totally (F.A.R.T.) Ghosts Council at Hogwarts Goblin Rights groups Hogwarts Board of Governors Inquisitorial Squad International Association of Quidditch International Confederation of Wizards (I.C.W.)
International Confederation of Wizards Quidditch Committee (I.C.W.Q.C.) International Symposium of Animagi Investigative Team Magical Congress of the United States of America Major Investigation Department Medieval Assembly of European Wizards Ministry of Magic Most Extraordinary Society of Potioneers Mudblood Death Camps National Gobstone Association Opposition Order of Merlin Order of the Phoenix Quidditch Union for the Administration and Betterment of the British League and its Endeavors (Q.U.A.B.B.L.E.) Rotfang Conspiracy
Salem Witches’ Institute Scourers Second Salem a.k.a. New Salem Philanthropic Organization Second Salemers Silver Spears Slug Club Snallygaster Protection League Society for Distressed Witches Society for the Promotion of Elfish Welfare (S.P.E.W.) Society for the Reformation of Hags Society for the Support of Squibs (S.S.S.) Society for the Tolerance of Vampires (S.T.V.) Troll Rights Movement Wizarding Supporters of Scottish Rugby Union (W.S.S.R.U.) Wizards’ Council