Quentin Haag is an American voice actor known for his work in English dubs of anime series and films, primarily during the 2000s. He was born on April 6, 1977, in Harris County, Texas.

Haag is most prominently recognized for his role as Ryou Ninomiya in the 2004 anime television series This Ugly Yet Beautiful World. He provided the English voice for this protagonist in the ADV Films dub of all twelve episodes. A notable aspect of this project was that he voiced the character alongside his real-life sister, voice actress Hilary Haag, who played the role of Kimi Ninomiya in the same series.

His other anime voice credits from this period include providing additional voices for the series Cromartie High School in 2003 and taking on the role of Toru Tsukioka in Gilgamesh, also from 2003. In addition to series work, Haag contributed to English adaptations of Japanese animated films. He voiced the character Arges in the 2007 film Appleseed Ex Machina and played the role of Nishioka in the 2002 live-action horror film Dark Water.