- Who
- Prince Harry
- What
- 1,430,000 unit(s) sold
- Where
- Not Applicable ()
- When
The fastest-selling non-fiction book is Prince Harry's memoir Spare, with 1,430,000 copies sold on 10 January 2023.
Prince Harry Spare's memoir sold 1,430 million copies on its first day. This is Prince Harry's first book.