The Extraordinary Adventures of Adèle Blanc-Sec (French: Les Aventures extraordinaires d'Adèle Blanc-Sec) is a gaslamp fantasy comic book series first appearing in 1976 written and illustrated by French comics artist Jacques Tardi and published in album format by Belgian publisher Casterman, sometimes preceded by serialisation in various periodicals, intermittently since then.

The comic portrays the titular far-fetched adventures and mystery-solving of its eponymous heroine, herself a writer of popular fiction, in a secret history-infused, gaslamp fantasy version of the early 20th century, set primarily in Paris and prominently incorporating real-life locations and events.

Adèle Blanc-Sec takes place in the same fictional universe as three earlier Tardi comics: Adieu Brindavoine ("Farewell Brindavoine"), serialised in 1972 in the Franco-Belgian comics magazine Pilote #680–700, its direct sequel La Fleur au fusil ("The Flower in the Rifle"), a ten-page one-shot first published in 1974 in Pilote No.

But upon the originally villainous Blanc-Sec coming into the comic he found he enjoyed drawing her far more than Rabatjoie and so she became the protagonist and title character, while ever since retaining something of a Lupin-esque moral dubiousness and disregard for the law.

A cynical heroine, she is initially a novelist of popular fiction, who turns to investigative journalism as her research and subsequent adventures reveal further details of the mystical world of crime.

[16]The Fantagraphics titles are: A live action feature film adapted and directed by Luc Besson, The Extraordinary Adventures of Adèle Blanc-Sec was released in France on 14 April 2010 and latterly in numerous other markets, including the United Kingdom.