The French literature from the late 19th and early 20th centuries that can be classified as “space fiction” centered on missions to Mars and making contact with Martians. The topic’s appeal stems from scientific findings of the time (particularly the so-called Martian canals) as well as the traditional symbolism of the Roman god who gave the Red Planet its name. All authors who wrote about Mars during the “Belle Époque” were inspired, to varying degrees, by the writings of the eminent astronomer Camille Flammarion (both scientific and fictional). The article delves into the specifics of how Joseph Rosnyaîné, André Laurie, Georges Le Faure, Henry de Graffigny, Arnould Galopin, Gustave Le Rouge, and Jean de La Hire interpret the Martian theme in their works. It is demonstrated that the use of traditional materials for popular novels is mixed with a desire to update popular literature’s narrative strategies. Thus, The Extraordinary Adventures of a Russian Scientist Across the Solar System by Le Faure and Graffigny, written between 1888-1896, contrasts the “intergalactic” theme, which was novel in French literature, with its archaic interpretation. The tendency to mix genres, to combine the “merveilleux-scientifique” (scientific marvelous) with Gothic and vampire literature approaches, as well as to augment the story with the occult component, increases. The so-called “martian duology” by G. Le Rouge, which lays the foundation for the poetics of horror – so vital to the 20th-century popular reading – is among the most significant literary works. The modernist bent is particularly evident in J. de La Hire’s 1911 book The Mystery of the Fifteen, which foresaw the rise of the superman hero, a new type of hero for the popular novel (however, this hero did not gain popularity in France).