List Of Harry Potter's Character "O"

• Idris Oakby – Founder of the Society for the Support of Squibs, J. K. Rowling's Wizard of the Month for October 2006
• Winkus Oddpick – Wrote an editorial for the Daily Prophet after the Chipping Clodbury Riot
• Bob Ogden – Ministry of Magic official in the Department of Magical Law Enforcement, came to the Gaunt house and arrested Marvolo and his son
• Tiberius Ogden – Wizengamot elder, resigns after Dolores Umbridge is appointed Hogwarts High Inquisitor by Cornelius Fudge
• Dunbar Oglethorpe – Chief of Quidditch Union for the Administration and Betterment of the British League and its Endeavours (Q.U.A.B.B.L.E.)
• Darren O'Hare – Quidditch Keeper for the Kenmare Kestrals, captain of the Irish National Team, inventor of the Hawkshead Attacking Formation
• Gondoline Oliphant – Studied trolls, killed by trolls. J. K. Rowling's Wizard of the Month for April 2005
• Barnaby Ollerton – Co-founder of the Cleansweep Broom Company with his brothers Bill and Bob
• Bill Ollerton – Co-founder of the Cleansweep Broom Company with his brothers Barnaby and Bob
• Bob Ollerton – Co-founder of the Cleansweep Broom Company with his brothers Barnaby and Bill
• Gifford Ollerton – Giant slayer, killed giant Hengist of Upper Barnton
• Garrick Ollivander – Son of Gervaise Ollivander, father of one son and one daughter, Ravenclaw student in the 1920s or 1930s, wandmaker, owner of Ollivanders, he is taken away by the Death Eaters, but is broken out of his cell by Dobby and Harry Potter.
• Geraint Ollivander - Medieval wandmaker, ancestor of Garrick Ollivander
• Gerbold Octavius Ollivander - Father of Gervaise Ollivander, grandfather of Garrick Ollivander, wandmaker
• Gervaise Ollivander - Son of Gerbold Ollivander, father of Garrick Ollivander, wandmaker