Places
Diagon Alley
Diagon Alley is the London shopping street hidden behind the Leaky Cauldron. It holds Gringotts, Ollivanders, Flourish and Blotts, and the shops where a student buys a wand, robes, and books. Harry’s first visit, with Hagrid, is the day he learns his parents left him a vault of gold.

First mention
Harry Potter and the Philosopher's StoneChapter: Diagon Alley
Hagrid brings Harry through the pub courtyard and taps the brick wall that opens onto the alley.