Den tidigaste nämna finns i Harry Potter och Philosopher's Stone Chapter 5: Diagon Alley.
‘What sort of magic do you teach, Professor Quirrell?’ ‘D-Defence Against the D-D-Dark Arts,’ muttered Professor Quirrell, as though he’d rather not think about it. ‘N-not that you n-need it, eh, P-P-Potter?’ He laughed nervously. ‘You’ll be g-getting all your equipment, I suppose? I’ve g-got to p-pick up a new b-book on vampires, m-myself.’ He looked terrified at the very thought.
Vi lär oss i Harry Potters kapitel 3 och Fångaren av Azkaban att Harry har sett en bild av en vampyr i hans DADA-klass.
Harry looked into the shadowed eyes of Sirius Black, the only part of the sunken face that seemed alive. Harry had never met a vampire, but he had seen pictures of them in his Defence Against the Dark Arts classes, and Black, with his waxy white skin, looked just like one.
Som du säger är den första gången han faktiskt möter en i HP och Half-Blood Prince