British author Joanne Rowling, also known as J.K. Rowling, is the richest author in the world with a net worth of $1 billion. Rowling is the author of the hit children's fantasy series “Harry Potter.” The seven-volume series sold over 600 million copies and has been translated into 84 languages.

As of 2026, J.K. Rowling's net worth is estimated to be approximately £945 million (roughly $1.2 billion USD). While she was famously the first author to become a billionaire, she has frequently fluctuated on and off official "billionaire" lists due to her massive philanthropic contributions through her charity, Lumos, and her private Volant Charitable Trust. Her wealth remains robust thanks to the "evergreen" nature of the Harry Potter franchise, which continues to generate hundreds of millions annually through book sales, the Wizarding World theme parks in Orlando, Japan, and Beijing, and the Harry Potter and the Cursed Child stage play. In 2026, her earnings have seen a significant boost from the development and early production of the Harry Potter TV series for Max (HBO), for which she serves as an executive producer. Despite ongoing public controversies, the commercial value of her Intellectual Property remains one of the most successful in history, ensuring her status as one of the wealthiest private citizens in the United Kingdom.