First editions of Philosopher's Stone, Chamber of Secrets and Goblet of Fire raised more than £7,000 for charity.
A writer called Simon Singh donated his own first edition copies of the Philosopher's Stone and the Chamber of Secrets.
And kind-hearted JK Rowling also helped out, handing over a signed first edition of Goblet of Fire to add to the sale.
First edition Harry Potters are like gold dust, especially ones of Philosopher's Stone.
Ones in good condition, like those in this auction, are very rare and can be really valuable.