List of The New York Times number-one books of 1984

The American daily newspaper The New York Times publishes multiple weekly lists ranking the best-selling books in the United States.

Changes to the list
Beginning on January 1, 1984, The New York Times Book Review introduced revised and expanded best seller lists to "clarify categories of book buying". The hardcover books list was previously divided into two lists: fiction (15 titles) and general (15 titles). The hardcover fiction list remained the same, but the hardcover general list was divided into two new lists: nonfiction (15 titles) and advice, how-to, and miscellaneous (5 titles). The nonfiction list would be reserved for "serious nonfiction" while the advice list would be dedicated to the self-improvement genre. This change to the list was made because advice best sellers were sometimes crowding the general nonfiction list. The inaugural number one bestseller of the advice list, The Body Principal by Victoria Principal, had been number 10 and number 12 on the general nonfiction lists for the two preceding weeks.

The paperback books list previously consisted of two categories: mass market and trade. Both categories were eliminated because the editors believed the distinction was "less important to the general reader than to the industry". Mass market and trade were replaced by three new categories: fiction (15 titles), nonfiction (5 titles) and advice, how-to and miscellaneous (10 titles). The miscellaneous category would accommodate cartoon books, joke books and other titles that were not listed before, including "road atlases, tax preparation guides and computer handbooks".

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

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