Casey Mongillo (born October 22) is an American voice actor, who has played roles in animation and video games.

Mongillo is best known for portraying lead character Shinji Ikari in the Netflix English dub of Neon Genesis Evangelion in 2019, and has also played Emporio Alniño in JoJo's Bizarre Adventure: Stone Ocean, Shou Suzuki in Mob Psycho 100, and Raichu, Scorbunny, Raboot, Cinderace, Chrysa, and Allister in the Pokémon anime.

In 2019, Mongillo voiced the main character Shinji Ikari in the Netflix dub of the anime series Neon Genesis Evangelion, replacing Spike Spencer, who played the part in the original ADV Films dub.

[3] Aja Romano of Vox wrote that it was laudable that Netflix cast a non-binary actor to play Shinji.

[5] Carol Grant, in an opinion piece for Vice, wrote that Shinji being played by a trans actor made the series feel more queer, saying that "Mongillo's delivery captures the delicate interplay between the masculine and feminine aspects of Shinji's voice and personality, bringing his bodily and gendered anxieties to life".