On Her Majesty's Secret Service is a 1969 spy film and the sixth in the James Bond series produced by Eon Productions. It is based on the 1963 novel by Ian Fleming. Following Sean Connery's decision to retire from the role after You Only Live Twice, Eon selected George Lazenby, a model with no prior acting credits, to play the part of James Bond. During filming, Lazenby announced that he would play the role of Bond only once. Connery returned to portray Bond in 1971's Diamonds Are Forever.

On Her Majesty's Secret Service is the tenth novel and eleventh book in Ian Fleming's James Bond series. It was first published in the United Kingdom by Jonathan Cape on 1 April 1963. Fleming changed the formula and structure from the previous novel, The Spy Who Loved Me, and made a determined effort to produce a work that adhered to his tried and tested format. The initial and secondary print runs sold out quickly, with over 60,000 copies sold in the first month, double that of the previous book's first month of sales. Fleming wrote the novel at Goldeneye, his holiday home in Jamaica, while Dr. No, the first entry in the James Bond film series by Eon Productions, was being filmed nearby.