De'Mario Monte Thornton (born June 13, 1985), known as Raz-B, is an American singer and actor, He is a founding member of R&B boy band B2K.

Born in Cleveland, Ohio, Raz B was a creator and member of the group B2K as a teen.

During his time in the group, B2K released their album, Pandemonium!, and performed on an accompanying tour.

Distributed through his own production company, RazBeatz Entertainment, Raz released his first single, Fire, in May 2007.

On August 19, 2013, during a performance in Zhejiang province, Raz B tried to stop a fight in the audience and was hit in the face with a glass bottle.