Ernst Stavro Blofeld is a fictional character and villain from the James Bond series of novels and films, created by Ian Fleming. A criminal mastermind with aspirations of world domination, he is the archenemy of the British Secret Service agent James Bond. Blofeld is head of the global criminal organisation SPECTRE and is commonly referred to by the codename Number 1 within this organisation. The character was originally written by Fleming as a physically massive and powerfully built man, standing around 1.90 m and weighing 140 kg, who had become flabby with a huge belly.

In the film series, Blofeld first appears in "From Russia with Love" (credited as "Ernst Blofeld", though the name is never heard), then in "Thunderball" (uncredited). In these two appearances, his name is never spoken, his face is not seen, and only his lower body is visible as he strokes his trademark white cat.

Blofeld appears or is heard in three novels: "Thunderball", "On Her Majesty's Secret Service"; and "You Only Live Twice"; as well as eight films from Eon Productions: "From Russia with Love" (1963); "Thunderball" (1965); "You Only Live Twice" (1967); "On Her Majesty's Secret Service" (1969); "Diamonds Are Forever" (1971); "For Your Eyes Only" (1981; the pre-title sequence of which shows an unnamed character resembling him fall to his death); "Spectre" (2015); and "No Time to Die" (2020). The latter two films are set in a rebooted continuity, which started with "Casino Royale" (2006).

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