The Adventures of Tintin (French: Les Aventures de Tintin [lez‿avɑ̃tyʁ də tɛ̃tɛ̃]) is a series of 24 comic albums created by Belgian cartoonist Georges Remi, who wrote under the pen name Hergé. The series was one of the most popular European comics of the 20th century. By 2007, a century after Hergé's birth, Tintin had been published in more than 70 languages with sales of more than 200 million copies, and had been adapted for radio, television, theatre, and film.

The series first appeared in French on 10 January 1929 in Le Petit Vingtième, a youth supplement to the Belgian newspaper Le Vingtième Siècle. The success of the series led to serialised strips published in Belgium's leading newspaper Le Soir and spun into a successful Tintin magazine. In 1950, Hergé created Studios Hergé, which produced the canonical versions of ten Tintin albums. Following Hergé's death in 1983, the final instalment of the series, Tintin and Alph-Art, was released posthumously.

The series is set in the contemporary world. Its protagonist is Tintin, a courageous young Belgian reporter and adventurer aided by his faithful dog Snowy (Milou in the original French edition). Other allies include the brash and cynical Captain Haddock, the intelligent but hearing-impaired Professor Calculus (French: Professeur Tournesol), incompetent detectives Thomson and Thompson (French: Dupont et Dupond), and the opera diva Bianca Castafiore.

The series has been admired for its clean, expressive drawings in Hergé's signature ligne claire ("clear line") style. Its well-researched plots straddle a variety of genres: swashbuckling adventures with elements of fantasy, mysteries, political thrillers, and science fiction. The stories feature slapstick humour, offset by dashes of political or cultural commentary.

"The idea for the character of Tintin and the sort of adventures that would befall him came to me, I believe, in five minutes, the moment I first made a sketch of the figure of this hero: that is to say, he had not haunted my youth nor even my dreams. Although it's possible that as a child I imagined myself in the role of a sort of Tintin".

Georges Prosper Remi, best known under the pen name Hergé, was employed as an illustrator at Le Vingtième Siècle (The Twentieth Century), a staunchly Roman Catholic, conservative Belgian newspaper based in Hergé's native Brussels. Run by the Abbé Norbert Wallez, the paper described itself as a "Catholic Newspaper for Doctrine and Information" and disseminated a fascist viewpoint. Wallez appointed Hergé editor of a new Thursday youth supplement, titled Le Petit Vingtième ("The Little Twentieth"). Propagating Wallez's sociopolitical views to its young readership, it contained explicitly pro-fascist and antisemitic sentiment. In addition to editing the supplement, Hergé illustrated L'extraordinaire aventure de Flup, Nénesse, Poussette et Cochonnet (The Extraordinary Adventure of Flup, Nénesse, Poussette and Cochonnet), a comic strip authored by a member of the newspaper's sport staff. Dissatisfied with this, Hergé wanted to write and draw his own cartoon strip.

He already had experience creating comic strips. From July 1926, he had written a strip about a Boy Scout patrol leader titled Les Aventures de Totor C.P. des Hannetons (The Adventures of Totor, Scout Leader of the Cockchafers) for the Scouting newspaper Le Boy Scout Belge (The Belgian Boy Scout). Totor was a strong influence on Tintin, with Hergé describing the latter as being like Totor's younger brother. Jean-Marc and Randy Lofficier stated that graphically, Totor and Tintin were "virtually identical" except for the Scout uniform, also noting many similarities between their respective adventures, particularly in the illustration style, the fast pace of the story, and the use of humour. He was fascinated by new techniques in the medium such as the systematic use of speech bubbles—found in such American comics as George McManus' Bringing up Father, George Herriman's Krazy Kat, and Rudolph Dirks's Katzenjammer Kids, copies of which had been sent to him from Mexico by the paper's reporter Léon Degrelle.

Although Hergé wanted to send Tintin to the United States, Wallez ordered him to set his adventure in the Soviet Union, in order to create antisocialist propaganda for children. The result, Tintin in the Land of the Soviets, was serialised in Le Petit Vingtième from January 1929 to May 1930. Popular in Francophone Belgium, Wallez organised a publicity stunt at the Paris Gare du Nord railway station, following which he organised the publication of the story in book form. The story's popularity led to an increase in sales, so Wallez granted Hergé two assistants. At Wallez's direction, in June he began serialisation of the second story, Tintin in the Congo, designed to encourage colonial sentiment towards the Belgian Congo. Authored in a paternalistic style that depicted the Congolese as childlike idiots, in later decades it was accused of racism, but at the time was uncontroversial and popular, and further publicity stunts were held to increase sales.