Maria Josep Guasch is a Spanish voice actor primarily known for her work in the Catalan-language dubs of numerous anime series and films. Her extensive career encompasses a wide variety of prominent roles, demonstrating her versatility across different character types and genres.

She has lent her voice to several iconic Studio Ghibli characters, most notably as Sheeta in Castle in the Sky and as the Witch of the Waste in Howl's Moving Castle. Her film work also includes the role of Hitoha Miyamizu in the critically acclaimed your name.. In the realm of television anime, Guasch is recognized for her performances as Namie Yaguchi in both seasons of Hi Score Girl, Maho Izawa in His and Her Circumstances, and Korosuke in Kiteretsu Daihyakka. She also voiced Farangis in The Heroic Legend of Arslan and Misato Katsuragi across various Evangelion productions, including the original Neon Genesis Evangelion series, its films Death & Rebirth and The End of Evangelion, and the more recent feature Evangelion: 3.0+1.0: Thrice Upon A Time.

Her career features significant recurring work within long-running and popular franchises. She had a substantial role in the Sailor Moon series, voicing characters such as Naru, Chibi Usa, and Chibi Chibi across multiple iterations including Sailor Moon R, S, SuperS, and Sailor Stars. Similarly, she contributed to the Case Closed (Detective Conan) franchise in several films, including The Last Wizard of the Century, Captured in Her Eyes, and The Phantom of Baker Street. Beyond these major titles, her extensive filmography includes roles in classic series such as Maya the Bee (as Billy), Vicke the Little Viking (as Ilvy), Monarch: The Big Bear of Tallac (as Nuca), Taro the Dragon Boy (as Aya), Mermaid's Scar (as Mana), Reporter Blues (as Antoinette "Tony" Dubois), and Serendipity Monogatari: Pyua-tou no Nakama-tachi (as Boubi).

In addition to her on-screen voice work, Maria Josep Guasch has also contributed to the dubbing industry as a dubbing director. She has held this role for the Catalan dubs of series such as Kiteretsu Daihyakka, Dr. Slump, and Cardcaptor Sakura: Clear Card.