Roger Leloup (French: [ʁɔʒe ləlu]; born 17 November 1933) is a Belgian comic strip artist, novelist, and a former collaborator of Hergé, who would rely upon him to create detailed, realistic drawings and elaborate decoration for The Adventures of Tintin.

By accident, he came into contact with the Franco-Belgian comics scene when his neighbour, Jacques Martin, told him that he desperately needed a colourist.

His work is seen in a wide variety of drawings, such as the Genève-Cointrin airport in The Calculus Affair and the impressive swing-wing supersonic business jet, the Carreidas 160 in Flight 714 to Sydney.

On 31 December 1969, Leloup left Studios Hergé to work full-time on his own series, Yoko Tsuno, with a focus on technology and science fiction.

The character Yoko Tsuno, a Japanese woman living in Brussels, is one of the leading examples of the female-fronted comics that appeared in European juvenile magazines during this period.