Ennead Architects LLP (/ˈenēˌad/) is a New York City-based architectural firm. The firm was founded in 1963 by James Polshek, who left the firm in 2005 when it was known as Polshek Partnership. The firm's partners renamed their practice in mid-2010.

James Stewart Polshek was an American architect based in New York City. He was the founder of Polshek Partnership, the firm at which he was the principal design partner for more than four decades. He worked as design counsel to the legacy firm Ennead Architects, as well as being actively engaged as design lead on multiple projects.