Gianni Sedioli (Ravenna, 4 August 1966) is an Italian cartoonist.
He made his debut as a comic book artist in 1992 with the children’s weekly Tiramolla.
In 1994-’95 he made Cronache di mondi fantasy for Luca’s Edizioni.
For Hobby&Work he designed two of the three volumes of the Steampunk miniseries.
In 1996 he founded Seagull Comics and produced The Witch and Sunglasses.
The following year he began to collaborate with the Sergio Bonelli Editore working for several newspapers and precisely: Jonathan Steele, Legs Weaver and Zagor.
He also produced two episodes of Agenzia Incantesimi published by Star Comics.