Andrea Castellan (born 23 Avril 1967), better known by the pen name Casty, is an Italian comic book writer and artist, mostly recognised for his contribution to the character of Mickey Mouse. Casty debuted in 1995, working on the Italian humour comic series Cattivik and Lupo Alberto. Since 2003, he has been writing Mickey Mouse comics for the Italian weekly digest Topolino. Starting from 2006, he has also drawn most of his Disney stories. Casty is regarded by many as the best Mickey Mouse cartoonist of his generation. His work mixes humour, adventure and suspense, along the lines of past Mickey masters Floyd Gottfredson and Romano Scarpa. His stories sometimes contain vintage sci-fi aesthetics and social themes, such as environmentalism.