Felix Leiter is a fictional character created by Ian Fleming in the James Bond books, films, and other media. The character is an operative for the CIA and Bond's friend. After losing a leg and a hand to a shark attack, Leiter joined the Pinkerton Detective Agency. The name "Felix" comes from the middle name of Fleming's friend Ivar Bryce, while the name "Leiter" was the surname of Fleming's friend Marion Oates Leiter Charles, the then wife of Thomas Leiter.

The James Bond series focuses on the titular character, a fictional British Secret Service agent created in 1953 by writer Ian Fleming, who featured him in twelve novels and two short-story collections. Since Fleming's death in 1964, eight other authors have written authorised Bond novels or novelisations: Kingsley Amis, Christopher Wood, John Gardner, Raymond Benson, Sebastian Faulks, Jeffery Deaver, William Boyd, and Anthony Horowitz. The latest novel is With a Mind to Kill by Anthony Horowitz, published in May 2022. Additionally Charlie Higson wrote a series on a young James Bond, and Kate Westbrook wrote three novels based on the diaries of a recurring series character, Moneypenny.