Niseem Onorato is an Italian actor and voice actor, born in Rome on October 24, 1966. He is the son of the noted actor and voice actor Glauco Onorato and the brother of voice actress Sara Onorato. Originally named Riccardo, he adopted the name Niseem in 2000 following a period of travel in India.

Onorato has built an extensive career in dubbing, providing the Italian voice for a wide array of characters in animation, live-action films, and television series. In the realm of anime, he is recognized for his portrayal of Orfeo della Lira, the Legendary Gold Saint of the Lyra Constellation, in the OAV series Saint Seiya: The Hades Chapter - Inferno. He also voiced the character Nicolas Vacheron in the 2004 OAV series Gunbuster 2: Diebuster.

His other prominent anime voice roles include Sesshomaru in the Inuyasha series and its films, Gourry Gabriev in a new dubbing of The Slayers, Captain Yamato in Naruto Shippuden, Paptimus Scirocco in Mobile Suit Zeta Gundam, and Griffith in the Berserk: The Golden Age Arc film trilogy. His work also extends to voicing characters in animated series such as Kumadori in One Piece and General Logi in Blue Dragon.

While his work in animation is significant, Onorato is also widely known as the primary Italian voice actor for actors such as Jude Law, Benedict Cumberbatch, Eric Bana, and Josh Duhamel. His dubbing of Benedict Cumberbatch's performance in The Imitation Game earned him the Leggio d'oro award for Voice Actor of the Year in 2015.