N O

Nagini ~ A serpent. [4,1]

N.E.W.T.s ~ Nastily Exhausting Wizarding Tests; final year wizarding examinations, Hogwarts' highest level. [3,16]

Nearly Headless Nick ~ Sir Nicholas de Mimsy-Porpington, Gryffindor ghost. [1,7]

Niffler ~ Magical creature with a taste for precious objects. A fluffy black creature with a long snout. [4,28]

Phineas Nigellus ~ One time Headmaster at Hogwarts. [5,6]

Nimbus Two Thousand ~ A broomstick, said to be the 'fastest ever', in its time. [1,5]

Norbert ~ A Norwegian Ridgeback. [1,14] Later found to be Norberta. [7,7]

Mrs Norris ~ The caretaker's cat. [1,8]

Norwegian Ridgeback ~ A species of dragon, laying huge black eggs. [1,14]

Theodore Nott ~ Student in Harry's year; sorted to Slytherin. [1,7]

Nott ~ Death Eater; father of Theodore (Slytherin student and friend of Malfoy). [4,33]

Nox ~ Reversal of the Lumos incantation; extinguishes light. [3,17]

Nurmengard ~ A prison for the wizarding community in Europe. Founded by Grindelwald. [7,18]

Honoria Nutcombe ~ Founded the Society for the Reformation of Hags (1665 - 1743). [jkrowling.com]

Obliviate ~ A charm to remove memories. [2,16]

Obliviator ~ Member of the Accidental Magic Reversal Squad at the Ministry of Magic. [4,7]

Obscuro ~ A blindfolding spell [7,15]

Occlumency ~ Magical defence of the mind against external penetration. [5,24]

Bob Ogden ~ Head of the Magical Law Enforcement Squad. [6,10]

Ogg ~ Gamekeeper, before Hagrid. [4,31]

Ollivanders ~ Makers of fine wands, since 382 BC. [1,5]

Omnioculars ~ Binoculars that slow down, speed up, freeze frame and review the action. [4,7]

Opal Necklace ~ A cursed variety may be found at Flourishand Blotts. [2,4]

Oppugno ~ An attack charm, directed at small creatures. [6,14]

Orchideous ~ Charm to produce a bunch of flowers; useful wand test. [4,18]

Ottery St Catchpole ~ Village near the Quidditch World Cup site. [4,6]

O.W.L. ~ Ordinary Wizarding Level; Exams taken after five years at Hogwarts. [2,12] Pass Grades: Outstanding, Exceeds Expectations, Acceptable. Fail Grades: Poor, Dreadful.

Owls ~ Carriers of mail [1,1]