List of The New York Times number-one books of 2003

The American daily newspaper The New York Times publishes multiple weekly lists ranking the best selling books in the United States. The lists are split in three genres—fiction, nonfiction and children's books. Both the fiction and nonfiction lists are further split into multiple lists.

Fiction
The following list ranks the number-one best selling fiction books, in the hardcover fiction category. The Da Vinci Code dominated the year, spending a cumulative 20 weeks at the top. Sales continued strong into 2004.

Nonfiction
The following list ranks the number-one best selling nonfiction books, in the hardcover nonfiction category.