Thorgal is a science fantasy adventure series created in the Franco-Belgian bandes dessinées (BD) tradition by Belgian writer Jean Van Hamme and Polish graphic artist Grzegorz Rosiński. Debuting in 1977, it has incorporated elements of Norse mythology and the legend of Atlantis, as well as science fiction and horror.

In 2002, it was adapted as an adventure video game, Thorgal: Curse of Atlantis, by Cryo Interactive Entertainment.

The comic first appeared in serial form in Tintin magazine in 1977, with the story La Magicienne Trahie. Originally a stand-alone 30-page project, its early success encouraged turning it into a longer series.

It has subsequently been published in hardcover volumes by Le Lombard from 1980 on. Translations have appeared in among others, English, Dutch, German, Polish, Italian, Spanish, Danish, Swedish, Norwegian, Tamil and Greek.

Covers for all comic albums are drawn by Rosiński, even for the spin-off albums which sometimes are drawn by other artists.

Thorgal is critically acclaimed and one of the most popular French language BDs, with more than 11 million Thorgal books in print. There are currently three ongoing successful spin-off series, in addition to the continuation of the main Thorgal series.

It has been called the most popular series published by Le Lombard.

D. Aviva Rothschild in her 1995 book Graphic Novels: A Bibliographic Guide to Book-length Comics praised the series, stating that it is "better than an American swords-and-sorcery comic" when it comes to both art and stories. Commenting on The Archers volume, Rothschild described it as "one of the finest pieces of heroic fantasy I have ever set my eyes on".