List of The New York Times number-one books of 1965

This is a list of books that topped The New York Times best-seller list in 1965.

Fiction
The following list ranks the number-one best-selling fiction books.

Only three titles topped the list in 1965. The most popular was The Source by James Michener, which dominated the second half of the year, even through a three-week newspaper strike. The other two titles were Herzog, by Saul Bellow, which completed a run at the top for more than half a year, begun in October 1964 (29 weeks), and Up the Down Staircase by Bel Kaufman (8 weeks, and another 32 at No. 2, in all spending 65 weeks in the top 10 bestsellers). Coincidentally, both of the latter titles, Herzog and Staircase, are epistolary novels, featuring the extensive use of letters.

Nonfiction
The following list ranks the number-one best-selling nonfiction books.