Nathan Stark is a fictional scientist and one of the main characters featured on the Sci-Fi Channel/Syfy series Eureka. Played by actor Ed Quinn, he was introduced as a series regular on the pilot episode of the series. He appeared in all twelve episodes from season one, all thirteen episodes from season two, and the first five episodes from season three.
Nathan Stark was the head of research for the government funded think tank known as Global Dynamics. He was the ex-husband of Allison Blake and the stepfather of Kevin Blake.