Madeleine Swann is a character in the James Bond films Spectre (2015) and No Time to Die (2021), played by actress Léa Seydoux.

Swann suggests Bond visit Vesper Lynd's (Eva Green) grave to get closure in his deceased lover's death.

Safin, still seeking revenge for his family, visits Swann and tries to coerce her into assassinating Blofeld with nanobot weaponry developed by rogue MI-6 scientist Valdo Obruchev (David Dencik).

Because the nanotechnology would kill Swann and Mathilde if they were ever exposed to it, Bond decides to sacrifice himself by staying behind on Safin's island as MI-6 missiles hurtle toward it.

Prior to Swann, Bond had fallen in love with only Tracy di Vicenzo (Diana Rigg) in On Her Majesty's Secret Service,[6] and Vesper Lynd (Eva Green) in Casino Royale.

British Vogue said "the French actor’s capable and complex creation was [a] perfect match" for Daniel Craig's Bond.

"[11] Mary Rose Somarriba describes Swann as a "near match, if not equal, to Bond in combat, assassination know-how, and intellect."

Swann is highly educated as a doctor in psychology, and despite being trained in combat by her father, she prefers to live far away from things that would tempt her back to that life, hence her station in the Austrian Alps at a private medical clinic.