Stefan Martello is an American voice actor born on July 27, 1988, and based in California. He is primarily affiliated with Bang Zoom! Entertainment, a major studio known for its English dubs of anime and other media.

Martello's career is focused on voice-over work for English adaptations of anime series and films. He has built a diverse portfolio of roles, often providing voices for supporting characters and additional voices in numerous productions. Some of his notable anime credits include the role of Hokuto Kurama in Scar on the Praeter. He also voiced Zoltan Akkanen in the film Mobile Suit Gundam Narrative. Other significant appearances include Wakuraba in Demon Slayer: Kimetsu no Yaiba, Tantimo in Edens Zero, and Masazo Kinoto in JoJo's Bizarre Adventure: Diamond is Unbreakable. His work also extends to popular series such as Lycoris Recoil, Cells at Work!, and Beyblade Burst: QuadStrike.

In addition to his anime work, Martello has lent his voice to several video games. His video game roles include Cephalon Cy in Warframe, as well as characters in Fire Emblem Heroes and Shadowverse.