Which Harry Potter book by J.K. Rowling was the first to be published under its American title, Sorcerer's Stone?

Harry Potter and the Philosopher’s Stone was the first Harry Potter book published under the American title Harry Potter and the Sorcerer’s Stone. The original British title used “Philosopher’s Stone,” while Scholastic changed the title for the United States edition.

The change was made because the publisher believed “sorcerer” would be more immediately understandable and appealing to American readers than “philosopher.” The story itself remained the same, although some vocabulary and details were adjusted between British and American editions.

This title variation is why references to the first novel can appear to name two different books. They are not separate installments: both titles identify the same 1997 British debut novel. The later books generally retained their British titles in the United States.