The New York Times Fiction Best Sellers of 1966
# The New York Times Fiction Best Sellers of 1966

This is a list of adult fiction books that topped The New York Times Fiction Best Seller list in 1966.

Only three novels topped the list that year, which was dominated by Jacqueline Susann's Valley of the Dolls which spent 28 weeks at the top of the list and 65 weeks in the top 10. Valley was toppled by Robert Crichton's The Secret of Santa Vittoria, a World War II story based on fact, which sold more than 100,000 copies in the first month of its release. It spent 18 weeks at the top of the list and nearly a year in the top 10. The other top seller of the year, James Michener's The Source, spent 36 weeks at the top of the list in 1965 and 1966.

| Date | Book | Author |
| - | - | - |
| January 3 | The Source | James Michener |
| January 10 | The Source | James Michener |
| January 17 | The Source | James Michener |
| January 24 | The Source | James Michener |
| January 31 | The Source | James Michener |
| February 7 | The Source | James Michener |
| February 14 | The Source | James Michener |
| February 21 | The Source | James Michener |
| February 28 | The Source | James Michener |
| March 6 | The Source | James Michener |
| March 13 | The Source | James Michener |
| March 20 | The Source | James Michener |
| March 27 | The Source | James Michener |
| April 3 | The Source | James Michener |
| April 10 | The Source | James Michener |
| April 17 | The Source | James Michener |
| April 24 | The Source | James Michener |
| May 1 | The Source | James Michener |
| May 8 | Valley of the Dolls | Jacqueline Susann |
| May 15 | Valley of the Dolls | Jacqueline Susann |
| May 22 | Valley of the Dolls | Jacqueline Susann |
| May 29 | Valley of the Dolls | Jacqueline Susann |
| June 5 | Valley of the Dolls | Jacqueline Susann |
| June 12 | Valley of the Dolls | Jacqueline Susann |
| June 19 | Valley of the Dolls | Jacqueline Susann |
| June 26 | Valley of the Dolls | Jacqueline Susann |
| July 3 | Valley of the Dolls | Jacqueline Susann |
| July 10 | Valley of the Dolls | Jacqueline Susann |
| July 17 | Valley of the Dolls | Jacqueline Susann |
| July 24 | Valley of the Dolls | Jacqueline Susann |
| July 31 | Valley of the Dolls | Jacqueline Susann |
| August 7 | Valley of the Dolls | Jacqueline Susann |
| August 14 | Valley of the Dolls | Jacqueline Susann |
| August 21 | Valley of the Dolls | Jacqueline Susann |
| August 28 | Valley of the Dolls | Jacqueline Susann |
| September 4 | Valley of the Dolls | Jacqueline Susann |
| September 11 | Valley of the Dolls | Jacqueline Susann |
| September 18 | Valley of the Dolls | Jacqueline Susann |
| September 25 | Valley of the Dolls | Jacqueline Susann |
| October 2 | Valley of the Dolls | Jacqueline Susann |
| October 9 | Valley of the Dolls | Jacqueline Susann |
| October 16 | Valley of the Dolls | Jacqueline Susann |
| October 23 | Valley of the Dolls | Jacqueline Susann |
| October 30 | Valley of the Dolls | Jacqueline Susann |
| November 6 | Valley of the Dolls | Jacqueline Susann |
| November 13 | Valley of the Dolls | Jacqueline Susann |
| November 20 | The Secret of Santa Vittoria | Robert Crichton |
| November 27 | The Secret of Santa Vittoria | Robert Crichton |
| December 4 | The Secret of Santa Vittoria | Robert Crichton |
| December 11 | The Secret of Santa Vittoria | Robert Crichton |
| December 18 | The Secret of Santa Vittoria | Robert Crichton |
| December 26 | The Secret of Santa Vittoria | Robert Crichton |
