Raffaella Castelli is an Italian voice actor known primarily for her work dubbing anime series and animated films for the Italian market. Her career encompasses a wide range of roles in popular franchises, demonstrating her versatility across different character types.

Castelli is perhaps best recognized for her long-running role as Merlin, the Boar's Sin of Gluttony, in the Italian adaptations of the popular fantasy anime series The Seven Deadly Sins. She voiced the character across multiple installments of the franchise, including the main television series The Seven Deadly Sins, its sequel The Seven Deadly Sins: Revival of The Commandments, as well as The Seven Deadly Sins: Imperial Wrath of The Gods, The Seven Deadly Sins: Dragon's Judgement, and the film The Seven Deadly Sins: Cursed by Light.

A significant portion of her career is dedicated to the Pretty Cure franchise, a long-running magical girl series. She has voiced several characters in its various Italian adaptations. Her roles include Choppy in both the Futari wa Precure Splash Star television series and its associated film Futari wa Precure Splash Star Tick Tack Kiki Ippatsu!. She also voiced Naoko Yamabuki in the series Fresh Pretty Cure and Yoshimi Takenouchi in the original Pretty Cure and its sequel PreCure Max Heart. In the Netflix adaptation Glitter Force Doki Doki, which is based on Doki Doki! Pretty Cure, she provided the voice for the character Rachel, also known as Glitter Quadri.

Beyond these major franchises, Castelli's extensive voice credits demonstrate her broad engagement with anime localization. Her other notable roles include Sarah McDougal in Love Hina and its Spring Special, Maki Karisu in Komi Can't Communicate, Shiori in Daa! Daa! Daa!, Izumi Isozaki in I''s Pure, Tsunami in both Magical Girl Pretty Sammy and Magical Project S, Bibi in My Patrasche, Chika Takatsu in an episode of Psycho-Pass, and Anzu in the original 1981 Urusei Yatsura series. She also voiced the character Daphne in the Italian animated series Winx Club. Her work also includes voicing characters in original Italian animated productions such as Stizza in I magicanti e i tre elementi and Tia in I Roteò e la magia dello specchio.