List of The New York Times number-one books of 2018

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 combined print and e-books category.

The most frequent weekly best seller of the year was The President Is Missing by James Patterson and Bill Clinton with 6 weeks at the top of the list, followed closely by The Great Alone by Kristin Hannah with 4 weeks.

Nonfiction
The following list ranks the number-one best-selling nonfiction books, in the combined print and e-books category. The most frequent weekly best seller of the year was Fire and Fury by Michael Wolff with seven weeks at the top of the list followed by Becoming by Michelle Obama with five weeks at the top of the list; this book continued to be a best seller in 2019.